Anne, unfortunately you aren't going to like what we have to say. The only way to fix that problem is to drain it and fix the base area. There's simply no quick-fix method to correct those crooked vertical posts and uneven base supports they sit on. There's a tremendous amount of force being applied to the sides right now and it could fail at anny time. Be careful. Much like a home or any construction project, the foundation is key to a successful pool set-up.
The sad thing he said up there. You need to ask if they will come get the water or something they have that can hold it while you work on leveling the area where the pool is. The water needs to be removed and the pool taken down so the ground can be dug out at the high spot. Do NOT try to bring the low spots up with dirt or sand. Time and again we have seen that fail!
I bet that area "looks" level to the eye but that water shows it is not. I am SO sorry this has turned out like this for you
Pat is right, I'm afraid. That pool is on the verge of collapse. It looks like someone could walk to the low side and just pull on the thing to cause it to fail, and there is nearly a hundred thousand pounds of water waiting to destroy anything in its path. It's just not safe.
The pool needs to be taken down and the ground dug down to level.
If you can find a used quick-set/Intex pool on craigslist/FB marketplace, you could pump the water to that for holding while you level your base. It doesn't have to be pretty, it just has to be able to hold the water while you take this one down and reset it. So sorry this happened!