Insert key on keyboard for Macbook Air Mountain Lion OS I have a MacBook Air running the "Mountain Lion" OS that is version 10.8 - 

What is the "Insert key" (Ins) or equivalent on Mac keyboard. ?
An external keyboard or on screen keyboard with numpad is required.

See page 4 here > http://na.sage.com/sage-300-erp/sage-300-erp-online/~/media/site/sage-300-erp/assets/online/Sage-300-ERP-Online-Mac-Resource-Guide.pdf

Mac keyboards lack the Insert key which is used in Sage 300 ERP for adding new lines to lists.

So instead, if using a Mac, on a keyboard with a number pad, with Numlock OFF, the “0” button will act as the Insert key.