Casual Avy is intended to be installed via package-install from MELPA, either directly or as a dependency to Casual Suite. After this installation, Casual Avy can be setup in a number of ways, as enumerated in the sub-sections below.
The design intent for using Casual Avy is to setup a global keybinding to the Transient menu casual-avy-tmenu. This keybinding is specified by the customizable variable casual-avy-keybinding which is by default set to M-g and can be changed to user preference.