Hi,

go to coinbase -> options -> API -> click create new API -> in the next window click all wallets and mark "wallet:accounts:read" (so this api is only for reading informations, important if someone steal your api, he can only read your balance) -> click create -> a new window open with your API and your secret (write down the secret, it will only show this time only!!!!) -> this is needed for AM.

in AM -> configurate balance -> exchange balance -> choose coinbase -> first line is only for the name -> 3 and 4 line for api and secret.

I hope this will help you. Not hesitate to ask again dude. Have a nice day.