The primary interface for Casual Org is the Transient menu casual-org-tmenu. It is autoloaded ((elisp)Autoload) so if Casual is installed via package-install ((emacs)Package Installation) then casual-org-tmenu can be invoked via execute-extended-command (M-x) without need for modifying your Emacs initialization file.
That said, Casual is designed with the intent of using a common (key)binding across multiple modes to lower cognitive load. This document uses the secondary binding M-m for this purpose, but can be changed to user preference. Note that casual-org-tmenu is intended to be used in conjunction with casual-editkit-main-tmenu. (EditKit Install).
There are many ways to configure this binding. Shown below is a straightforward implementation:
(require 'casual-org) ; load all dependencies including `org', `org-table' (keymap-set org-mode-map "M-m" #'casual-org-tmenu) (keymap-set org-table-fedit-map "M-m" #'casual-org-table-fedit-tmenu)
If lazy loading is desired then try using eval-after-load:
(eval-after-load 'org (keymap-set org-mode-map "M-m" #'casual-org-tmenu)) (eval-after-load 'org-table (keymap-set org-table-fedit-map "M-m" #'casual-org-table-fedit-tmenu))