I am not even going to ask how you can break a ram slot when installing slot.
Well, you broke one ram slot right? Try using the other slots and see if it boots up.
If it does, then use the mobo until you save enough for a new one.
Be sure not hte break the new mobo again.
If it doesn't boot up, then you will still need a new mobo.
I don't think you can fit it unless you are exceptionally good.