My toilet flange is level to the tiles.. that's not good. It has become a problem because it is leaking into the next room. How do I replace that?

A new wax ring(I have even had to use 2 at times) should take care of the leak problem,or making a plywood base to raise the base up(a piece of treated plywood cut to the exact size of the base)

Hope this helps,
Ken

You can use a thicker wax ring and this will help but the best thing to do here besides remove the flange is to get a flange extender, it's the same size but about a 1/2 thick, it fastens on the existing flange via screws. You can get them at Lowe's or other home centers