There are many settings to configure the forum for your personal taste:
You might like to add your picture - it makes the forum friendlier 
. Click on your user icon top right, select 
\Preferences\Profile Picture.
The default theme is dark blue background to match our new webpage. If you prefer a light background, select \Preferences\Interface\Theme\Light.
You can also set your \Preferences\Interface\Default Home Page - currently set to Categories.