1. The only session or the default session cannot be deleted.
2. Completed sessions cannot be edited or deleted. 

Steps to follow:
Step 1: Open your Dashboard. ( > sign in > Dashboard)

Step 2:  On your dashboard, click on Airmeets on the left panel of the page. Choose the event for which you want to edit the session and click on View Details to see the details of the event.

Step 3: Click on Sessions on the left-hand panel of the page. Choose the session you want to edit or delete. Edit or delete a session by clicking on Pencil Icon or Bin Icon.

Step 4: Enter and modify the session and once done click on the "Update session" button.