If you can still log in, change them.
If not you'll need to contact the web host and get them changed. If they refuse to help (they should be able to once you can prove that you own the site and the account) you'll need to contact the former employee and get the passwords from them.
This is why multiple people should have the passwords for such accounts.
Last Wiki Answer Submitted: February 12, 2011 8:11 pm by Denny Cherry64,520 pts.