if you've joined an inactive coven to be a member, like mentioned above, some covens have it set so you need to be approved, or an application is needed. double check what the coven says in it's home page.
if you've joined an inactive coven to be the leader, if both priest and priestess are inactive, it falls upon Pet to decide who is going to lead. Pet's very busy, so be prepared to wait a few months.
third option is find an active coven to join that suits your needs.