Found a manual but can not get remote to operate the door. Changed battery and still no luck.

Does the door operate with the hard wired button? If so check to see if the dip switches match between the remote and the circuit board on the opener,usually under a small door on the unit.

Thanks for the help... took the remote apart and found the remote was rusty on the circuit board, just bought a new remote

Make the two dip switch boards match and you should be good to go.