Manufacture the usual starting point for an author (like with standard FrameMaker, but with elements rather than paragraphs)
This step is not necessary if you did everything in the right order so far. Anyhow you need to specify a root, e.g. have something like this in your EDD file:
Element (Container): StepbystepValid as the highest-level element.General rule: Doctitle, Info?, Abstract?, Intro?, Prereq?, Steps+, Comments?, Conclusion?
Import the definitions from the EDD file into your template file. This is roughly the same as entering <!DOCTYPE Stepbystep SYSTEM "/home/schneide/xml/dtd/Stepbystep.dtd"> in a standard XML file. In the blank page (!) do:
Menu: File->Import->Element Definitions
You can repeat this step each time you change something in the EDD
If everything went well you can use F+S as XML editor. Since we didn't define any formatting yet, I suggest that you turn on Element Boundaries Viewing:
Menu: View->Element Boundaries (as tags)
You can author XML now and export as XML I suggest to test quite a bit now if your DTD is brand new.