Here’s a great article
https://binkybunny.com/BUNNYINFO/LitterboxTraining/tabid/62/Default.aspx
As for the rest, it takes time. Some bunnies get it immediately, but others take a month or so. I got Samson from a pet store, but they were in this huge tub pen and on solid ground, so I think Samson grew up knowing he pooped and knew he liked it in one spot. I just got Sweets a couple days ago from a “breeder”, she was raised in a cage 3 feet off the floor and I’m pretty sure she has no idea what those balls are that are surrounding her all the sudden. She’s going to take a lot more work than Samson did.
Sooo, moral of that story, I’m keeping her in the bathroom, have 2 litterboxes with hay in them (and make sure the hay is in a corner or up against the wall, otherwise they’re just as likely to stand next to the box and eat the hay). Keep sweeping up her poops as often as you can, she’ll get it eventually.
Oh, and when she’s out of the cage she should have a litterbox too for awhile. Samson now just goes in the one in her pen, but while she was younger I had 4 around the room.