Have you read how-to.txt that comes with Atlas yet? I'm guessing you have, but if you only looked at the readme it's really easy to get overwhelmed. Basically, all you need to do is add a header to your script before any text you wish to insert. This header should just define the table(s), pointer location(s), and any other things you need (header, addressing mode). Then you use the #JMP function to jump to the offset where you will insert the text, and you should be good to go if the pointers are already set up in Atlas format.