i was create a file in seasons skin (you can do also it in any skin) with html variants .my settings.i name my file zwntana.html.tmp for example.
after that edit the skin.conf in [CheetahGenerator] section.
put this
[[Zwntana]]
[[[index]]]
template = zwntana.html.tmpl
save the file. in next weewx upload data see the zwntana.html file .