1-Why are the top few threads of this forum in bold?
These are new threads since your last visit, I guess. If you click "Mark Forums Read" all the threads shown as "New Posts" will disappear.
2-What proportion of forum users live in UK?
Certainly not me.
3-Is there a tutorial on how to use these forums well?
Sort of:
https://www.mobileread.com/forums/fa...b3_board_usage