Hi mellissa177,
Thanks so much for using Apple Support Communities. It's great to have you here. If I understand your post correctly, you're having trouble signing in on your Apple TV.
Do you know what model Apple TV you have? Identify your Apple TV model is a helpful resource you can use to verify what Apple TV model you have.
If you have a 2nd or 3rd generation Apple TV, you may need to enter in a six digit verification code at the end of your password. Check out the following article under the section "What if I use two-factor authentication on a device running older software?" that can help you complete that process.
Two-factor authentication for Apple ID
Kindest regards.