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Hope the Arch Linux Wiki help you https://wiki.archlinux.org/index.php/AMDGPU

Read this: https://wiki.archlinux.org/index.php/Dhcpd
Or this: https://prefetch.net/articles/iscdhcpd.html

I suggest you to reed: https://www.kali.org/docs/
And try another GNU/Linux distro that is recommended for new users.

Install another terminal such a terminator, alacritty, xterm or urxvt and try to add the icon in the menu, but i don,t recommend using Gnome Desktop because is heavy and low customizable.

This is why you don't execute random script from GitHub. Even the GitHub page for the tool say:

Disclaimer
Evil Limiter is provided by bitbrute "as is" and "with all...