If you haven't given up or already figured it out, I highly recommend this thread:
https://xoops.org/modules/newbb/viewtopic.php?start=0&topic_id=57133&viewmode=flat&order=ASC&type=&mode=0

Thank you VERY MUCH, skenow, for your clear explanations and respect for us newbie who have brains but are unfamiliar with XOOPS. I learned more about how to use XOOPS reading your tutorial than anything else I've yet found online. Kudos to you for giving your time and energy (albeit a few years, and versions, back) to help the neophytes and uninitiated. You took me from frustration to self-confident. May karma reward you - and soon!