A member can be deleted only if they are not an attendee in an existing meeting.
To delete a member:
Select a member from the Meeting Body Members pane.
On the Administration tab, click Delete to save changes to the member.
You are prompted to confirm that you want to delete the member.
Note:
Deleting a member removes the member from the list of current members and removes them from all meeting bodies. Deleting a member will not affect any existing meetings to which the member is currently associated.
Click Yes to continue deleting the member. Click No to cancel deletion.