My Chamberlin garage door opener MyQ has:
Item # 737047
Model # C410
1. Try to loosen the chain and 2. Disconnect the wall control 3. Test which two wires (red and white) are for the wall control 4. Test the learning – make sure it works 5. Possibly check/adjust the chain tension 6. Connect the wall control – make sure it works 7. Figure out the safety sensor, how to wire, etc.
Here are a few helpful tutorial links: