You can add contacts from various address books to your iPhone.
1) Navigate to "Settings" and "Mail, Contacts, Calendar"
2) Select "Add account"
3) Choose the address book you want to connect with follow the rest of the authentication process.
4) Once the account has been added, make sure that you have enabled contacts sync
This will now add your contacts to your iPhone contact list. When you next open your Covve app you will be asked whether you want to add this new address book to the list of iPhone contact groups that your Covve account synchronizes with.