I recently installed my flapper in my toilet and it was working over the last couple of days. When I went to use it this morning, I noticed the flapper was not going down. In other words, it was not returning to the seat. It remained up. I loosened the chain and tightend the chain. Can anyone make any suggestions on possible resolution?

Add some weight to the flapper

Did you cut the ring off the flapper before you installed it on the hooks?
Let me give you the tank adjustments.
With the flapper seated the linkage wants to have 1/4" of play. Too much play and the flapper doesn't get pulled back enough giving you a short flush. Too tight and it lets water seep past the flapper. I adjust the chain by the link and if it needs fine tuning, I bend the flush lever rod a bit untill I have the desired play in the linkage. One more thing about a flapper. you will see where the old flapper hooks onto the base of the white overflow tube. On a older type with no hooks the flapper has a ring that slips down over the overflow tube to the seat. If your tank has hooks, take a sharp knife or scissors and cut the neoprene ring off on the marks provided and hook the flapper on the hooks. Leaving the ring on will interfere with the flush. The water level in your tank should be 3/8 to 1/2" below the top of the overflow tube when the tank's filled. Good luck, Tom

You may have worn out a few flappers by now, but if I were "Flapper," I wouldn't want to go down in it either! :)

A smart-mouthed newbie is just what we need here, right?

Thanks for the question and answers. Might be helpful to me and a number of others. I'm exploring the "ancient" wisdom on the site as well as watching the inflow of new stuff.

When those flappers try your patience,

ddd

Tom has stated very well follow his instruction I am sure it will work for you, also the link bellow has some info also.
Replace The Toilet Fill Valve, Flush Valve Or Flapper