How can I get my Apple TV home sharing to work?

[iMore Question]

I would like to have my Apple TV linked to all three TV's in my house, how can I do this?

 

[SwitchBeach]

Do you have an Apple TV device for each computer?
Have you read this? https://www.apple.com/support/homesharing/getstarted/#mn_p
And this? https://support.apple.com/en-us/HT202190