If you share a presentation with others, you can view or change its access and permission settings at any time.
If you’re the owner of a shared presentation with access set to “Only invited people,” or if the owner gave you permission to invite others, you can change access or permission for all participants.
Go to the Keynote app 
on your iPhone.
In a shared presentation, tap 
in the toolbar, tap Manage Shared Presentation, then tap Share Options.
Do any of the following:
To change who can access the presentation, choose an option under Who can access:
Only people you invite: The original link no longer works for anyone. Only people who receive an invitation from you and who sign in to their Apple Account can access the presentation.
Anyone with the link: People you originally invited can still open the presentation, along with anyone else who has the link. They don’t need to sign in with the email address or phone number you used to send the link.
To change who can make changes to the presentation, choose an option under Permission:
Can make changes: People can edit the shared presentation.
View only: People can view the shared presentation but not edit it. They can’t reply to or delete comments in the activity list, and when they join a presentation, no notifications appear.
To change who can who can invite others to share the presentation, choose an option under Adding People:
Anyone can add people: All participants can invite new people to collaborate in the presentation.
Only you can add people: Only the owner of the presentation can invite participants.
Tap Back, then tap Done.
If you set a presentation’s access to “Only invited people,” you can set a different permission for each individual.
Go to the Keynote app on your iPhone.
In a shared presentation, tap in the toolbar, then tap Manage Shared Presentation.
Tap a participant and choose any of the following:
Can make changes: This participant can edit the shared presentation.
View only: This participant can still open and read the presentation, but they can no longer edit or comment.
Remove Access: The presentation is removed from the participant’s iCloud Drive, and the link to the presentation no longer works. Any edits they made to the presentation remain.
To let the participant invite others to the presentation or change the presentation’s access and permissions, turn on “Can add people.”
Tap Back, then tap Done.
Anyone who has the presentation open when you change their settings receives an alert. If the change causes the person to lose access to the presentation, the presentation closes immediately. Otherwise, the new setting takes effect when they dismiss the alert.