iCloud 
Manage subscribers to your shared streams
You can add more subscribers to and remove subscribers from shared streams you own. You can also choose whether to allow subscribers to add photos and videos to a shared stream you own. Only the owner can manage subscribers.
On an iOS 7 device
In the Photos app, tap Shared at the bottom of the screen, then tap Streams at the top of the screen.
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Tap the shared stream whose subscribers you want to manage, then tap People.
The Activity stream doesn’t have subscribers.
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Do any of the following:
To invite more people, tap Invite People, enter email addresses or tap the Add button
to select from your contacts, then tap Add.
To remove a subscriber, tap the subscriber, then tap Remove Subscriber.
To choose whether subscribers can add photos and videos, tap Subscribers Can Post.
If the subscriber list doesn’t include Invite People, you don’t own the shared stream.
On an iOS 6 device
In the Photos app, tap Photo Stream.
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Do one of the following:
On iPad, tap Edit, then tap the shared stream whose subscribers you want to manage.
On iPhone or iPod touch, tap the arrow to the right of the shared stream’s name.
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Do either of the following:
To invite more people, tap Add People, enter email addresses or tap the Add button
to select from your contacts, then tap Add.
To remove a subscriber, tap the subscriber, then tap Remove Subscriber.
If the subscriber list doesn’t include Add People, you don’t own the shared stream.
On a Mac using iPhoto or Aperture
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For instructions, see one of these iPhoto Help or Aperture Help topics:
On a Windows computer
Select iCloud Photos under Favorites in a folder window of File Explorer (Windows 8) or Windows Explorer (Windows 7).
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Double-click the shared stream whose subscribers you want to manage, then click Options in the toolbar.
If you see Info but don’t see Options in the toolbar, you don’t own the shared stream.
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Do any of the following:
To invite more people, click Add, enter an email address, then press Enter.
To remove a subscriber, select the subscriber, then click Remove.
To choose whether subscribers can add photos and videos, turn “All subscribers to add photos or videos to this photo stream” on or off.
Click Done.