Each deal will have one of three permission levels: Public: Read Only, Public: Read & Edit, and Private. The permission level of a deal can be set using the Share button on the Deal Summary page.
?? Need an explanation here on how membership and permission level is related. Are added members the only people that have access to a private deal? Can all members of a private deal edit the deal? Is there anyone that can edit a Public: Read Only deal?
To change privacy level:
To add members: