I wish you wouldn't. The developers and (more pointedly) sponsors of JQM already do enough to foster the fanciful idea that one can create a JQM site with no programming background.
I don't think that JQM is appropriate for those with no programming experience at all. It would be difficult to impossible to explain many of the fundamental concepts without programming experience or training.
If you must, you can show them how to create pages for JQM, and give them a set of rules (some of which will go against the documentation) and tell them "just do it this way, and don't ask why".
(One would be "do not create multi-page documents, because they will eventually bite you." Another would be "don't try to make it work with random scripts not designed for JQM". IMO, it takes more programming experience to pick a good and appropriate script than it does to actually write one. So, with no programming experience.. )
Since they do have some HTML and CSS experience, it's a good opportunity to give them some REAL HTML and CSS experience. Any kind of CSS overrides will give them plenty of that. I'd think some coverage of HTML/CSS inspection tools would be essential.