I have Apple TV on my iPhone and tv but I just signed up for apple plus but I can not get it on my Apple TV what do I do??

To play Apple TV+ content and other Apple TV app content on a TV, you should have access to the Apple TV app on your TV.

• Some smart TVs have the Apple TV app directly available.
• Some connected streaming devices have the Apple TV app available to bring it to your TV through HDMI.
• Some TVs are AirPlay-enabled to allow streaming form an iPhone or similar.

Devices you can use with the Apple TV app and Apple TV+ - Apple Support

Apple TV app-supported devices and AirPlay 2-enabled TVs - Apple Support

All the ways to watch Apple TV+ - Apple Support