How to Enable Multiple Presenting Authors for Abstract Submissions

How can I allow submitters to mark multiple first co-authors and corresponding authors on an abstract submission?

In the Dryfta event management platform, to enable submitters to select multiple presenting authors (such as first co-authors or corresponding authors) on an abstract submission, you need to enable the relevant setting in the submission settings. 

Go to Abstracts & Reviews > Submission Settings page in the administration panel, and look for an option "Allow multiple presenting authors" . Enabling this option will let submitters select more than one presenting author for an individual submission.