PB help

[TechX69]

*im wondering how to edit gui files? i want to change the color of the interface in the lobby*i want to modify function of register button on login"i managed to remove the picture but still clickable, i want to change the url if possible if not i want to remove the click function"*i also want to add some weapons, items, etc in shop list.*and disable auto create of accounti(already done)https://www.youtube.com/watch?v=0iuOXohiZ9I&t=565sany suggestions?and website to register on the database of the game.

[MentaL]