This is where you control who can view and edit your campaigns.
From the menu list at the top of the screen, choose:
All: All of the users that appear in the Grant access to checkboxes list will be able to view and edit your campaign.
Only Me: You will be the only user who can view and edit your campaign. All other checkboxes will appear clear.
Me and selected users: The Grant access to checkboxes list becomes enabled so you can select the users who can view and edit your campaign, in addition to yourself.
Click Save when done.