Get yourselves a Phiomia as well! Feed it stimberries and you'll have plenty of medium feces to throw in the dung beetle. Fill it up, and come back and watch more fertilizer than you can imagine. I'll never use compost bins again!
Make a separate building for the beetle. It wanders around, and can be quite annoying, as it's usually in the doorway. Put it near your greenhouse, or somewhere easily accessible to encourage your tribe to keep it loaded with poo.
Personally I have found the easiest way to tame a dung beetle is to lie down and crawl up to it. Make sure you stay on the ground once you are near, otherwise they get angry and attack if you stand up!