How do I change the current homesharing ID on Apple TV?

I initially set up homesharing using my roomate's ID. I have switched homesharing to my own ID on my iphone and all household computers with itunes, but on apple TV it says "to access itunes library on apple TV, turn on homesharing in itunes on your computer using (roomate's ID)."

How do I change it so that I can use my ID for homesharing on AppleTV?

Thanks!