Users have to be active and avoiding negative behavior over a sustained period of time, which earns trust levels, which allows you to then use some of the fancier aspects of the forum.
While it can be frustrating for new users, it also means bots and trolls can’t create a burner account and flood the forums with explicit or malicious content.
If you’re interested in building trust level, just start civilly participating in the forums and it will come.
I’d also advise you that calling out Blizzard in the title is explicitly warned against in the pinned “Please read!” post, so you might wanna, y’know, read it. Welcome to General Discussion - Please Read!