My question is very simple. How can I sign out my session of this forum?
click on your profile image (currently looks like this, because of a bug: ) in the top right corner of the page, scroll down to the bottom of the list of notifications in case it is too long to show the bottom and there click on “log out”.
Alternatively* just press SHIFT + Z, SHIFT + Z (you can actually hold SHIFT and press Z twice) when you’re not editing a post or other text field (otherwise you’ll just type ‘ZZ’).
*Adding this method in case the broken user icons make life difficult…