How to link games to account?

Hey guys, first of all, I dont know what happened with telltale and the series of TWD.
Today, I bought all the games from series (Season 1, Season 2, Michonne, 400days, New frontier and Final season) on Steam. I want to ask, how can I link them to my profile?
I joined to my profile and I have New Frontier linked from 2018, but without anything.
Is there any way how to link it for statistics and stuff like this?
Oh, and I heard about "Definitive Series" but I cant found it to buy it.
Can I get some information too?
Thanks guys for help


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