Hi If anyone can help me
I'm making a 3 tier cake with mouse filling and fondant and I made it and put the fondant on it but its its a little lopsided what can I do to fix it I am putting chocolate piece on it would that cover it up

I would just try to cover it up. Trying to fix it might make it worse. Maybe someone else will have a suggestion. good luck

It depends on just how badly lopsided it really is; what you are going to do with the tiers; how you supported it; and how it will be decorated.
Hopefully it is just a bit off and adding decorations will hide it.
If it is lopsided enough of causing it to fall you definitely will have to take it apart and start over.
If it is just a bit off on the bottom tier the higher you go up the more it will lean