Hello! Can u help me a bit?

Hello guys,
I need ur help! Im new to this platform- so Im not so good at editing my acc! I wanted to put background and border for "about me" part in my acc, But I couldnt;_; Can somebody teach me how to ?
My EngLisH iS BroKEn
https://i.pinimg.com/originals/57/f8/8e/57f88e49872cb11e9fe4b0cad4669881.gif