Updating contact details and photo

To get to the preferences to manage your Support Community profile click on your user name above, then Preferences. This is also accessible from the profile icon (or in your case the head and shoulders placeholder icon) which you can see towards the top left of the page - next to the More drop-down label.

This opens up a new set of options including location - be general and don't put your address etc.

You can add a custom avatar when you get to level 3, which requires 500 points.

Have a look also at Share what you know and get recognized - Apple Support