Board Thread:Support Requests - Getting Technical/@comment-29037175-20160726032541/@comment-30195593-20160726052223

At the bottom of the page, the should be a "Categories" bar. Click edit, then add a category. Then hit "save".

Or you could go into the source editor for the page and add "Category:(categoryname)" to the page.

As for the wiki navigation header, add the category page name instead of "category1" or "category2". To see how to make a drop-down list, see Help:Navigation