For deactivating STATIC_MENU, I’m sorry that the big SUPER TURBO settings panel is not as obvious as I hoped it was, here is the answer:
Go to this menu and uncheck STATIC_MENU:
I hope this helps.
But for installing STATIC HEADER, as said in the banner, you need to get the Stylus extension, before you can install the userstyle, just like you install the userscripts. 