TRYING TO PAIR HCDZ FIRESTICK WITH TV, I AM HAVING PROBLEMS ?

There cold be something wrong with the HDMI ports or the HDMI cable then or there might be a problem with your firestick then. Try a new firestick and a new HDMI cable to see if that helps.If the TV's screen is still flashing then there is a problem with the back light and the LCD for your TV.

Pair Firestick remote to TV
Go to Settings on your Fire TV. Select Controllers & Bluetooth Devices. Select Amazon Fire TV Remotes. Press and hold the Home button for 10 seconds to pair your remote.

Amazon.ca Help: Pair Additional Fire TV Remotes

Videos as well

https://www.google.com/search?q=television+remote+control+to+access+my+Amazon+Fire+Stick

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A little more info may be needed. Does your TV say this as soon as you plug in your firestick or does it say this when you are trying to play a video? If the first hold down rewind "<<" while holding top circle of remote (outer ring) for 15 seconds. It is likely that your TV resolution is out of spec for the Firestick (4k?) and you will need to enable "legacy" (older) resolution mode on the Firestick. If this does not work, there are you You Tube videos on enabling this mode for your Firestick. If the second, then you are trying to play a video with an unsupported video Codec, in which case you would need to find a supported video.

Why would you buy kodi installed FireStick when you can do it yourself in a few minutes? I mean, OK, you don't have any problem to spend some additional money in buying Kodi preinstalled Fire Stick but what if you get problems later? It is always better to know how to install Kodi on Firestick as it will help you in future too. How to Install Kodi on FireStick

Yes you can continue to use your cable. Firestick is connected to the HDMI port. You must have your tv source on HDMI to configure Firestick. Lastly, you must have a good wireless internet signal to setup Firestick.

Hope this helps.
Can Register Device or Software Application

I’m happy to help further over the phone at https://www.6ya.com/expert/adrienne_b03fb46fc6334991

1.Replace batteries.(in remote)
2.Get within 12 inches from firestick.
3.Press and hold home button for 10 seconds.
This should now pair with firestick, and should work.

It would be channel 1 on the channel selection I think.