Want to use watch as remote on Apple TV and iTunes.
Want to use my watch with Apple TV and iTunes on my lap top.
Asked: 02:24 07/06/2016
Follow the instructions here:
Use Apple Watch as a remote control for iTunes or Apple TV - Apple Support
If you have not yet done so (your post indicates that you are using iOS 8.3 on your iPhone), it may first help to update your iPhone and Apple Watch with the latest software, starting with your iPhone:
Update the iOS software on your iPhone, iPad, or iPod touch - Apple Support
Update the software on your Apple Watch - Apple Support