many users are asking how to change the password on the forum.
Here is a rapid hint:
After logged in in the forum page, in the top right part of the page you should see a "Welcome" box and a little "pencil" icon.
Click on this pencil icon, and you will be prompted with a page to change information associated to your account. From there, you can also change your username and password.
Hope this helps, but do not hesitate to ask more.