I'm curious as to how the server links this account to Unturned. Like If I bought a rank/account upgrade, how is the rank applied to me? I don't know if I'm making any sense there, but if you need clarification I'll try and be clearer.
You click on your profile then you go to "External profiles". There you can see "Steam Integration" and "Discord Integration". When you associate your account with steam that will "link" them and when you buy a rank on the forums, it will also get applied on unturned.