help!!!

so,
i say i  "Forgetten your password?"
and it sends me an e-mail
blah blah blah i'm signed in
and im at the forums
i go to change my password and i have to enter the old password
so i go to my e-mail and i copy it then paste it in and enter my new password yada yadda yadda
it says "wrong old password"
help!!