IDAutomationFM Plugin http://www.idautomation.com/filemaker/native/
OSX version? Filemaker version? your user has administration rights?
Are you going to do this in house only OR are you going to sell the database to others?
You have watched their video on how to generate code? http://www.youtube.com/watch?v=InKKsgZYOvc
From their Compatibility and requirements list
Intended Implementer FileMaker Database and Application Developers;
End users and non-developers should use IDAutomation's FileMaker Barcode Fonts.
What steps have you taken, where does it fail?
I have Mac OS x 10.7.4, Filemaker 11 and 12, i am the Admin on my mac. It is for my company.
The video you recommend has been removed.
i downloaded the IDAutomationFMPlugin.zip, extract, i did copy the "IDAutomation.fmplugin" into my mac/user/....extentions/ then i open Filemaker to recognize it, it does, but on layout when i go to format a field i apply the (ID_auto.. 128) font i cant find it.
Did a Google for "idautomation youtube"
Link to their YouTube Channel http://www.youtube.com/user/IDAutomation/videos
The video about Filemaker is here http://www.youtube.com/watch?v=p_Jnn6A5z3U&feature=plcp
I watched it and it is fairly straightforward.