I have mistyped a user name that included my password (I forgot to hit the tab button) and now, when I log into sites, it shows up as a choice to log in. I really don't want to pick another password because it is what I use for multiple websites. How do I get rid of that? Thanks.

 

If you are using Firefox go to Tools -> Clear Private Data, then make sure saved passwords is checked and click Clear Private Data Now. If you're on IE I think it's somewhere in the options menu.