While you can have any number of reviewers reviewing and scoring an abstract, the only people who can ultimately accept or decline a submission is an administrator.
To Accept or Decline a Submission:
Go to the Events tab.
Click Edit beside the event you want to request an abstract for.
Click Submissions in the Event Details box.
Click Edit next to the abstract you wish to decline or accept.
In the Status field, select either ”Accepted“ or ”Declined.“
When the page refreshes you will see that the status has changed. Any reviewers for this abstract will also see this change when they log in. This status is not permanent and can be changed by an administrator at any time.