[babatong]

How on earth could it get more obvious to tick the tickbox labelled 'log'?

How you search the created logfiles is up to you, znc is not a log management system, it merely creates.

[jeena]

Uhm, ZNC runs on the console, there can not be a "tickbox labeled 'log'" because there is no GUI?

[PuercoPop]

znc comes with an web GUI to admin/configure it.