In either editor, how to indicate "this is footnote"?

It’s clear how to insert an incrementing link to a footnote, but nowhere is it clear how we actually label the footnote itself so the link from the source reaches the target footnote. Any description how this is expected to work?

Also, is the specific SW & version used for the board mentioned anywhere? I couldn’t find it, and it made it very difficult to try and find any external info (nor is there any topic/FAQ/etc. which details finesse editor markdown stuff like that, or a general reference to all available marks for that matter).

Any help appreciated, thanks!