The phpBB software that powers this forum has a user guide that you may find useful. Click the various links on the left side of the page to select topics. Additional information specific to IN-OZ appears below.
Changing Your Password and Other Profile Settings
Click your name at the top of any page, select User Control Panel and then the Profile tab. Then you can select Edit account settings to change your password, or other links there to change other aspects of your profile. In particular I suggest you prepare and upload a photo or other image for your avatar; maximum dimensions for that are 120x120 pixels.