I have no idea what is wrong with it, it just stopped opening, with both the car opener (I replaced the battery, so that's not it) & the main opener inside the garage. I am not mechanically inclined so please keep it simple. There are no instructions :(thanks in advance
wood tick gives good advice. Sounds like a broken belt/chain maybe. If the red handle has been pulled you will see the belt or chain moving the door bracket socket moving back and forth. The good news is by pulling the red handle and lifting the door by hand you can get your cars out. I will need more info to help. But,it sounds like a tech call sorry if you have tried all of these things.
Does the motor run when you push the button? If so, the emergency release may have become disengaged. There should be a rope with a red handle hanging near the front of the track. Pull that so the latch springs up, push the button, and you are set. If the door attempts to open, or goes up part way and then comes back down, look above the door. There are 2 springs mounted to the header, one on each side. One may be broken. If so, call a service tech to replace them. Although only one may be broken, the other probably won't be far behind. You pay for double on the parts, but only one service call. If that doesn't correct the problem, call a tech. The motor may have seized, or there could be any number of other problems. Hope this helps.