iCloud 
Resend invitations to your shared stream
If someone didn’t receive an invitation to your shared photo stream or if you want to remind someone to subscribe to your shared stream, you can resend invitations.
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.
Tap the shared stream that has the people you want to invite again, then tap People.
Tap the person you want to invite again, then tap Resend Invitation.
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 that has the people you want to invite again.
On iPhone or iPod touch, tap the arrow to the right of the shared stream’s name.
Tap the person you want to invite again, then tap Resend Sharing Invitation.
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 Favourites in a folder window of File Explorer (Windows 8) or Windows Explorer (Windows 7).
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Double-click the shared stream that has the people you want to invite again, 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.
Select the person you want to invite again, then click “Resend invitation.”