Internal Server Error?

[-=Leb=-]

Hi everyone , i never had this problem before, so everytime i try to email my members the activation codes or email password reminder, it gives me this error for some reason.

Yesterday i could use this option without any problems and i didn't install anything on the forum.

Any idea how i can resolve this problem ?

I read something about .htaccess but i have no clue how i can find this file to rename it. Anyway maybe the problem i got its diffrent from the other members here at vb website

How do i check the server logs anyway?

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, support@supportwebsite.com and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.