While listening to a station on the “Now Playing” screen, click on the three dots on the lower right.  This will open a menu with an offering for “pin to start page.”  Upon clicking, this action will navigate to the Windows Phone 7 start screen, creating a new tile of the station. 

If audio is playing, the station tile will update to show album art and flip back to show artist and song name.
 
Note: Your Windows phone 7 must have Mango OS (7.5) and iHeartRadio 3.0 installed.