My toilet flapper will not stay open long enough for the water to come out of the tank, so the toilet does not get flushed all the way. I have adjusted the chain and that does nothing.
Also the water level has to be below the water level line, or the water that is in the tank will slowly flow into the tube that is connected to the flapper and just makes a constant water running sound.
I just don't know what to do.

So the water level has to be well below the water level line in order to keep it from flowing in the tube, but I still have a problem with the flapper not staying open. Also the water flows into the tank much slower than say my other tank, but my other tank is newer. This tank is old. The flapper is probably just under a year old. It is a universal flapper... it is a korky flapper with yellow float.

I'm sorry, I don't know why my question is not complete.

It's complete enough for me. Let's adjust your tank parts, Check the tank water level, it should be at the mark in the tank or 3/8 to 1/2" below the top of the over flow tube. Now look at the flapper, If it has wavy edges on the flat surface, replace it. The linkage between the flapper and the flush lever should have 1/4" play when the tank is filled. Also, check the small tube coming out of the top of the ballcock and make sure it's connect to and draining into the white overflow tube. If the leak is at the base of the tank there are two brass bolts on both sides of the flapper, if the tank is loose, leaking or wobbly, snug up the bolts. If there is dampness at the base of the bowl, pop off the china caps and snug down the closet bolts. I would check all this out before paying 50$ for a service call and 50$ a hour thereafter. More questions? I'm as close as a click.
Now let's check out that lazy slow filling ball cock, Let me know what ballcock you have and we'll get started. Good luck, Tom

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Thank you for your information. I have not had a chance to look at it... terrible migraine for days... still.
I have a fill pro fill valve.
Whatever adjustments I made that day, the flush has gotten better but def not 100 percent. I still have to hold the handle down, but not quite as long as before. I couldn't even tell you what I did other than, I raised the water level a little bit, shortened the change and adjusted the fill valve... idk if I made the flow less or more... I think less.
My six year old son even noticed the difference... The flush seems stronger.

*shortened the chain, not changed...

Oh and I do not have a ballcock. I do have one in my other toilet.

Try moving the yellow float lower. If this doesn't work, purchase a universal corky flapper without the float.

Okay thank you. I will try that.

I will give an update, in case others read this.

Yep, please keep us posted on your progress.

Ok so I shortened the chain even more, and I think that has made a difference, as in the flush seems stronger, but I'm still having to hold it down, so I will get a different flapper and try that... it's going to be so annoying since I have the chain part down, and I'm going to have to try all over again. It's just crazy how fast and well my other toilet works. This one is quite old though and the tank is much larger. I also cleaned out the little hole inside the toilet bowl... it wasn't that dirty though.
If I flush without holding the handle down forever and a day, the water that is in the bowl will not completely go down so whatever is in the bowl is leftover... but like I said even holding down the handle is better/stronger than before.
So I will give update after I get new flapper.
The problem that I have had with the flappers in the past though, is I would get one either too big or too small! I don't even know what brand this toilet is!

Let's adjust your tank parts. Check the tank water level, it should be at the mark in the tank or 3/8 to 1/2" below the top of the over flow tube. Now look at the flapper, If it has wavy edges on the flat surface, replace it. The linkage between the flapper and the flush lever should have 1/4" play when the tank is filled. Also, check the small tube coming out of the top of the ballcock and make sure it's connect to and draining into the white overflow tube. If the leak is at the base of the tank there are two brass bolts on both sides of the flapper, if the tank is loose, leaking or wobbly, snug up the bolts. If there is dampness at the base of the bowl, pop off the china caps and snug down the closet bolts. I would check all this out before paying 50$ for a service call and 50$ a hour thereafter. More questions? I'm as close as a click. TOM

Just take the float off. Some flappers have adjustable drain holes to slow the drop.

Flappers with floats are a different breed than standard flappers. The float is the only thing that keeps the flapper up. Removing the float will make the flapper drop like a rock right away. A standard corky flapper will stay up until the water lever drops to almost nothing in the tank. Trust me, Ive tried removing the float on these type of flappers, and it just makes things worse. Ive never been a fan of float flappers, but many times if you install a regular flapper on a toilet that was factory supplied with a float flapper, you end up with a double flush. Amazing how simple toilets used to be, and how sensitive they are these days.