Q1: How to edit templates?
A1: Edit files under templates/ and do "module update" in module manager
It's just a fib
"default template set" means module's default.
"module update" does not mean loading customized template, but means reloading modules specs written by module author.
Of course, template manager in system module is hard to use, I know.
But there is tplsadmin module now.
http://www.peak.ne.jp/xoops/md/mydownloads/singlefile.php?cid=1&lid=66
This is the right way to customize templates.
- create a blank template set (custom)
- set the template set into preferences -> general
- copy a template which you want to customize, from default to custom
- edit the template in custom
Don't forget downloading custom template set as backup at regular intervals.