Covve is designed to automatically synchronize with all available contact groups on your device. So, if you have multiple accounts on your device (e.g. Google Contacts, iCloud, Exchange etc.), these contacts will also appear in Covve.
At the moment, there is no way in Covve to select a specific contacts account to sync with, or to maintain a contact list separate with the contacts you have on your phone - but we are already working on both of these!