Making Sets Private in Flickr (Changing Permissions)

--Select “Sets”

--Select the set whose permissions you want to change; click on “Edit”

--Select “Batch Edit” 

--Select “Change Permissions”

Sharing Sets in Flickr

--Open a set

N.B.: Sharing a set will depend on the Permissions settings.  If it is public, the link itself will suffice.
If it is private plus friends, the link will suffice if a guest pass is issued.  If it is private, it will not be shared.

--Click on the Send/Arrow box

--Select E-mail

--Shorten link

--Click "Friends"

--Click OK