Its easy to changed your Java-Forums account password.
Step 01: Login to your account that you wish to changed the password.
Click on this link https://java-forums.com/settings or On the top right corner, click on your name and select settings
Step 02: In settings page, you can see change password and change email.
Step 03: Click on change password "Send Password Reset Email" button to send the password reset instructions to your registered email address.
Thats it !