There are two documents covering Frame Relay configuration in the ATLAS, depending on if you want to connect the Frame Relay endpoint to the internal router in the ATLAS or connect it to an external router.
For connecting the Frame Relay to the internal router in the ATLAS you should follow this guide: https://supportforums.adtran.com/docs/DOC-1298
For connecting the Frame Relay to an external router you should follow this guide: https://supportforums.adtran.com/docs/DOC-1297
Hope this helps,
Since there has been no further discussion on this, I will mark it as "assumed answered." If it is not answered feel free to continue the discussion.