Modifying the Subscription preferences of individual Contact records can easily be done through the Subscriptions tab in their record. But additionally you can also subscribe multiple people to a single publication at one time.
1. Subscribe Multiple People to a Publication
2. Go to the Publications page
Click on the Communications dropdown and select Publications.
3. Subscribe/Unsubscribe your contact records by clicking on the Action dropdown.
a. Depending on which publication you want to subscribe or unsubscribe the contacts from you'll want to click on the Action dropdown and select the corresponding option Subscribe Contact Selection or Unsubscribe Contact Selection.
Note: When you unsubscribe a group of contact records this cannot be undone. It is possible to reconstruct who was receiving a publication by searching activity records, but there is no simple "undo" button for batch unsubscribes.
b. Once you are done selecting the Action click on Save Contact Publications to apply the changes.