Add a specific internet radio station as one of your presets

Press the star on the now playing screen.

Thanks, I'll do it when I get home.  

Also, when you've got a few station presets saved, don't forget you can scroll to the bottom of the list and tap edit presets, then drag the stations up and down to change the order in which they appear.

Can help with showing the stations you listen to most if your list gets a bit unwieldy.