Hi bel29nor,
Thanks for visiting Apple Support Communities.
If you have changed your Apple ID and need to set up Home Sharing on your Apple TV again, follow these steps:
Apple ID: What to do after you change your Apple ID
http://support.apple.com/kb/HT5796
To play content from your Mac or PC on an Apple TV, complete these steps on your Apple TV:
- Go to Settings > iTunes Store > Apple IDs.
- If you signed out before changing your Apple ID, choose Add New Apple ID and enter your current Apple ID and password.
- If you're still signed in with your previous Apple ID, choose Sign Out, then choose Add New Apple ID and enter your current Apple ID and password.
- Go to Settings > iCloud.
- If you signed out before changing your Apple ID, choose Sign In. You'll be asked whether you want to sign in with the Apple ID that you entered for the iTunes Store. If you use the same Apple ID for iCloud and the iTunes Store, choose Yes.
- If you're still signed in with your previous Apple ID, choose Sign Out, then choose Sign In. You'll be asked whether you want to sign in with the Apple ID that you entered for the iTunes Store. If you use the same Apple ID for iCloud and the iTunes Store, choose Yes.
- Go to Settings > Computers, then turn off Home Sharing and turn it back on.
Best Regards,
Jeremy