A key problem with installing software that's more than a couple of years old these days:
1) It's open source software, so the documentation sucks
2) Most search results are 5+ year old content and don't work for the current release
Yes, I know how to do search time controls in search engines. It can help a little, or often just results in no answers at all (which of course isn't necessarily worse than wrong answers, lol.)
In this case the software in question is eJabberd... and I'm wondering if the shit documentation is a deliberate ploy to encourage people to use the attached commercial entity project owner's consultancy or hosting services.