Run the CUI (Command)
Select the 'acad. cuix' (or a custom partial . cuix).
Select LISP files and Right-Mouse Click.
Select Load LISP from the context menu.
Browse to the location of the LISP to add and select the file.
Click Apply and Close to exit the CUI editor.

Regards,
Jimmy Wick

***THE POST HAS BEEN EDITED: TIPS NOT RELATED TO AUTOCAD FOR MAC HAVE BEEN CROSSED OUT***