Administrators have the ability to undo approval on previously approved investor subscription agreements.
Select the investor on the Closings menu.
Then select the Undo Approval option on the right panel. Note, this option will be idle and unavailable to select if the investor has not already been approved (is not in the "Fully executed" status).
Once the approval is undone, administrators will be able to add comments and / or send the document back to the investor for any necessary updates if needed.