Board Thread:Support Requests - Designing Your Wiki/@comment-35685406-20180526002257/@comment-28228601-20180527020719

if you mean a template go to: yourwiki.wikia.com/wiki/Template:the_name_of_the_template_you_want_to_create and click the edit/create button.

see also https://www.mediawiki.org/wiki/Help:Templates