Installation from the Gnome Shell Extension Website

Installation is simple, just slide the switch to ON.
EGO OFF
You will be prompted to Cancel or Install. Select Install..

EGO ON
After installation the website can be used to enable, disable, set extension's preferences,
or remove the extension.

EGO INSTALLED

Alternative Installation from the Gnome Shell Extension Website

Gnome Shell Extensions can be installed from an extension zip file with the gnome-tweak-tool.