How do I roll up my blind, there is no cords. I accidentally rolled it up and now it won’t come down

They might be Tangled in one spot you have to find it to detangle them and they'll loosen up by themselves

Pull down and to the left and release cord while still holding to the right. Pull up and to the left to make it stop when you release it. Hope that helps, it might be reversed for yours. Hopefully it is not.