After hearing a pop noise when attempting to accelerate, the car will not Move or go in drive or reserve?

When adding transmission fluid, it leaked right out? I stopped at a red light and rev my engine lightly, When I tried to pull off my car wouldn’t move anymore. I heard a pop noise but didn’t see any parts on the ground, I checked the transmission fluid it was very low, so I added more, and it leaked right back out. Also, when I rev the engine and tried to change it to drive, I heard a noise like something scrubbing. Can someone please tell me what this issue is so I can get it fixed?