Nope, if you can log into these forums (and your browser isn't just "remembering" you when you load the page), you don't need to change your password. The same password you use on these forums is the same one to log into Paragon Chat. Try the forum password in Paragon Chat and see if it lets you in.
If you DON'T remember the password, and you're auto-logging in, then the email address issue I can help with in Private Messages. Click on "My Messages" above.