What happens next?

How to burn a divx movie to play in a dvd player 
Verify that your mac has a dvd drive. 
If you purchased your mac within the last 4 years chances are it won't have a built in dvd drive. Look for a thin slot about 5 inches long along the right side of your computer.

Possible answers:
(1). This will let you insert your mac in the drive and space it up so it stays inside. Insert the dvd drive into the drive..
(2). If it's not there, you'll have to buy an external dvd drive. You can buy apple's own external usb dvd writer, superdrive, for ~ $79, or select from a range of similar but less expensive options from companies like lg and samsung..
(3). Ensure that your mac has a usb drive. Click on your usb cd-rom drive..
(4). It should be labeled " cd-rom player " with a few pops to show the image. Insert one-inch plastic disk into the drive..
(2).