If you just installed Awesome Support on a WordPress site that already has registered users, those users don’t need to create a new account. However, there are a few things to adjust in order to give them the capabilities to open tickets.
Typically, an existing user trying to submit a ticket will get an error message saying “You do not have the capacity to open a new ticket”. This is quite easy to fix. Please see Users get “You do not have the capacity to open a new ticket” for more information.