To share a specific piece of content with a friend, simply navigate to that content.  Tap the screen to expose the top navigation and Actions Menu (three ellipses). Tap the Actions Menu.

Click the Share button from the Actions Menu to launch the email form.  

Enter the recipient's Name and Email address in their respective fields, and then click the Add button.  Repeat this for as many recipients as needed; they will all be listed at the top of the form and default with a checkmark.  

Enter a Subject, Message and/or Notes and then click Send.  (All of these fields are optional).  

You can also share from your Favorites list.