Step 1: Import DVD to the program
After installing it, just hit "File -> Load DVD" to locate the DVD movies you want to add.

Step 2: Output settings
Select 3G2 as output format from Format list.

Step 3: Find a directory
Click the "..." button circled below to change the default place to store the converted files.

Step 4: Conversion
When everything is all right, click the "Start" button to start converting DVD movies to 3G2 on Mac.
Aparting from converting DVD to 3G2 on Mac OS X, the best DVD to 3G2 Converter for Mac, also can convert DVD to 3GP Mac, convert DVD to iPod Mac, etc.