I've never used a Mac before so I really couldn't help you on that one.

I googled 'Mac equivalent of insert key' and landed a few people with the same query, no devinitive answers though! Have a look in the Maya help menu ( 'f1' I hope your mac has that!!) if you can't get anything from that get in touch with Autodesk.

Good luck,

Mat.

edit:

Just found out that it's the fn + left arrow keys. See THIS .