#1. Custom button: This is a custom request, I can only assist you with a solution, if you want us to customize it, there will be a fee for this request.
#2. Please go to Admin dashboard -> Appearance -> Elementor Header & Footer Builder -> Footer bar -> Edit with Elementor: https://ibb.co/HGrw7Fm
-> Click Navigator (1) -> Select Tablet or Mobile (2) -> Click Edit Widget (3) -> Edit Item widget(4): https://ibb.co/XsrcQtC