There is no user guide I have seen, but it is fairly simple to use and learn.
The campaign toll can be used for the following:
Recording campaign events (these will be sorted by date);
Note that the tool for recording battles should also automatically link the campaign territory/racket to the victorious gang.
Also worth noting that most of those actions are limited to the campaign admin but thankfully you can just make everyone a campaign admin (if you trust them not to muck around with things).
The rest of the stuff is usually managed by each gang owner in their gang page. Campaign admins also get full edit access to each persons gang as well.
On the gang page credits can be added by simply clicking the edit button at the bottom of the first big grey box. The same function can be used for adjusting anything that appears in that big grey box.
Anything relating to individual fighters (weapons and wargear, xp, skill selection, etc.) is handled in the gang manager by clicking on the fighter you want to update and then clicking on the little pencil symbol or + symbol attached to what you want to change.
If anyone is not seeing the little pencils and + symbols then they are having an error with their browser and need to fix it or try a different browser. Common errors are script blockers, font errors, and browser cache errors.
Edit: I’m not sure what you will be able to see in this one but this campaign called the Cogfather is the best one I have been a part of that has used the tools to their best capacity.