Help, I can't see my posts

My post page has become so tiny I can't read it. I had finished my post and was getting ready to preview it when I shsrank it quite by accident. I had no idea what I did or how to undo it. Everything I tries fails, and the grandkids are due to arrive, so will post it as it is, errors and all and hope to be able to clear this up soon. sorry, for my continued computer ineptness.