A Co-op will allow you to play, chat, and exchange items with other farmers. 
To join a Co-op, tap on the Townhall.
You will see a selection of recommended Co-ops. Tap on a Co-op, then tap the Info button to find out specific information about each Co-op. This will help you find the best Co-op for you. 
Once you have decided which one to join, tap the Join button of the Co-op you have chosen.
If the Co-op you want to join is not in the selection, you can find it by tapping on the Search tab and entering the Co-op’s name.
Tap on the Envelope tab to view your pending Invites and Requests.
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FarmVille Game GUIDE