How do I make my mirrored object work independently? I've made a human using the mirror modifier, but now that I'm almost done, I want to be able to edit the body on both sides without the mirror effect. I want to move around the left arm without the right one moving, and I want to be able to interarct directly with the right side (which is the mirrored side).

I've looked for a while and have found different suggestions and solutions, but non of them has worked for me.
Apply the modifier using Apply button, that is located below the modifier name. Then you will be able to edit both sides separately.