Sorry, I don't do games, so I have no idea of how those forums are designed; besides, this isn't really the medium for detailed explanations. Suffice it to say that your site does not seem to use encryption so your password isn't secure in transit.

You might register on this site and browse around. It specialises in games development so just try searching for "security", "logons" and stuff like that:

http://www.gamedev.net/