Well... For the basic kind, you push the wheels to move them. I guess you'd need some arm strength for that. Or you can have someone easily push you. There are handles in the back.

[ He doesn't want to get Bran's hopes up, since Killua honestly has no idea if Asgard has wheelchairs at all, but if they do... ]

I've seen motorized ones you can move and turn with some switches, but like I said, I don't know if they've got 'em here. We could see if anyone around here knows. I've talked to some people using the bracelets, and they're pretty convenient, actually.