K. I'm gonna assume you kno to first unlock the bag and then lift the handle until it is standing straight up. That's all there is to it. Since I would bet your are afraid of the hang-up you get while lifting the handle, it is perfectly normal. Just wiggle a little (if that makes you feel better) and lift. It will feel like it wants to break, but it won't. It will loosen up as you use the bags more. I try to clean those crevices out real good when I wash the bike just to help keep them smooth.
Be careful putting them back on and make sure all the bag connection parts are in the bike connection parts. It can be difficult to figure out at first. Have fun.