If Covve is linked to Gmail or Outlook / Exchange
To use your AOL contacts with Covve you can export them from AOL and import them into the address book that you have linked with Covve (gMail or Outlook). These will synchronize with Covve.
Instructions on how to export your contacts from AOL can be found here.
Instructions on how to import your contacts can be found:
a) Here for Gmail
b) Here for Exchange/Outlook
c) Here for Office365
If Covve is linked to your iPhone
Alternatively, if Covve is linked to your iPhone you can add AOL to your iPhone contacts and this will in turn synchronize them with Covve.