Sounds like you are looking at your photo stream album. You first have to create a shared photo stream. Search iPhoto help for "Create a shared photo stream" to see how. After create your shared photo stream album, you can then select it, click on Info, then type the email address(es) of the people you want to invite in the "Shared With" section and press enter. Note: click on Turn on Public Website if any of your subscribers do not have iCloud accounts.