Changed my WordPress and Site address 'by mistake'

Hello,
I needed to change my domain name from .net to .com, but I mistakenly simply went into my dashboard > Settings > General and changed it from there.

Little problem, I now cannot enter in my .net Dashboard, and the .com has nothing in it.

Question is, how do I change back the wordpress and site address in order to work on my http://www.hellenicdragons.net site?
I will then check to make sure what I have to do to actually transfer the whole .net to the .com, but for now, I need access to my .net! 😉

Thank you!