- Click on the big button in the header next to ‘Local’ that says ‘All’.
- Click the drop-down field directly next to ‘All’.
- Click ‘Active’ from the drop-down list.
- Click on a thread loaded on the page.
- Reply to users in that thread.
Congrats! You have successfully done a brigading! Pat yourself on the back! Next seminar, we will be covering how to subtly deceive strategically-important redditors with a simple tactic they don’t know of called ‘whataboutism’ 
Edit: meant to post this in the secret group chat where we coordinate the fall of the west. Sorry y’all. My bad 
When people here seek out stuff on the other instances to post there yes, but a lot of the time it's people coming here and kicking the hornets nest in which case I don't think it's brigading at least in spirit.
Brigading is a dumb concept anyway, but trying to convince ex-redditors of that is a waste of time
Brigading is organised protest, which is important for the health of society