I don’t know if there’s a “definitive guide” - it’s not that complicated to get a torrent client up and running. What kind of content are you looking for? Movies, Series, Music, Games, Books…?
Best is probably to try to get access to a decent private tracker, and an “easy” one - one with a bonus point system for seeding and uptime - that makes it much easier to keep a good ratio with a NAS, if you’re just permanently seeding everything you download, you’ll get points and “rise the ranks” of that tracker.
Once you’re a high enough rank on that tracker, you’ll get access to their “Invite Forums” where other private trackers advertise and give out invites to their trackers
What software/OS are you running on your NAS? If you’re running some goofy software on a private tracker your client might not be whitelisted.
Besides that - this NAS is attached to your home network I assume? Is it behind a router? Are the ports you’re using for torrenting port-forwarded?
What tracker are you testing this on? A bunch of trackers will have a “Connectivity check” that will tell you whether or not your client is connectable
Github issues are annoying that way. You could solve it by closing down “issues” and using discussions instead. People can up and downvote discussions, and you can see that from the listview, unlike with issues.
And you can have threaded conversations in discussions.