From your profile page, click on your avatar at the top of the page to upload a new one.
From your profile page, click on the "Edit Profile" button. From the drop-down, click "Toggle Theme" to change to a darker theme. Click it again to go back to the default theme.
Since the forum was custom built without an existing forum software package, support for Tapatalk has ended as they do not have an open API to develop against. The new site works very well on a mobile browser.
The old software was a pain to update and manage. The new software was developed by scratch so I'm deeply familiar with how it functions. This will allow for easier updates in the future, which means a better experience for everyone in the long run.