fob Programming a Second Key Fob for 2020 Silverado Trailboss

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Hey all, 

I have looked and looked for more clear instructions on how to program a second key fob for my 2020 Silverado (dealership lost 2nd set). I live 8 hours from where I bought the truck and the dealership I bought it from would need the truck to program it. I am trying to do it myself. I have followed this guide but still no luck. The youtube video that is out for it is if you are programming a key fob without already having one programmed. It wasn't much help for me. Any GM Mechanics have a quick write up they can copy and paste would be appreciated. 

 

These are the two things that haven't been enough help for me. 

https://www.youtube.com/watch?time_continue=228&v=TUGuBOYIGr4&feature=emb_logo

https://www.programyourremote.com/classified/2020-gmc-sierra-keyless-entry-remote-fob-smart-key-programming-instructions-listing-9870.aspx

 

Thanks in advance