Concert manners/courtesy?

Hey so I’m going to the God Kid concert in St. Paul next week and it will be the first concert I have ever gone to. I just wanted to ask a couple questions.
How does getting Jung’s signed work? Do I just go up and ask them, or do I do something else? Also is there any unsaid rules or things like that I should follow? Any advice will help I just wanted to make I’m not being weird or rude to anyone there.