All user-settable Ada mode variables can be set via the menu ‘Ada | Customize’. Click on the ‘Help’ button there for help on using customize.
To modify a specific variable, you can directly call the function
customize-variable; just type M-x customize-variable
<RET> variable-name <RET>).
Alternately, you can specify variable settings in the Emacs configuration file, .emacs. This file is coded in Emacs lisp, and the syntax to set a variable is the following:
(setq variable-name value)