tap settings from the homescreen and then go into your photos and camera options

Here enable the 'Shared Photo Streams' if you do not have it enabled!

Then tap on your photos app

In the app, tap on the Photo Stream at the Bottom

Then on the '+' sign in the top left corner

then add a name to the photostream, and add the e-mail adress of the ones you want to share it with!

Note: if the person you want to share it with has iOS 6 installed then they will recive a notification and will be able to view pics in photos app. otherwise enable the wesite feature!

Then Choose the photos you want to share and tap on 'done' on the top right corner

thats it:) after you will be able to comment and like the photos between the shared people!

Have Fun!!!