Help logging out of mail app in mac?

Asked by Tink (8673) December 30th, 2009 from iPhone

My cousin used my computer on Sunday to check her mail and didn’t log out. Although I do enjoy reading her mail I want to log her out of it.

I’m new to this so I don’t really about that. I went to the help area on it but it didn’t so much, it just gave me options on adding another account, which I don’t want to do.