Thread:Piisfun/@comment-34517845-20180509171619/@comment-34929636-20180509174019

Press the add page button, then name the page anything that starts with 'Template:'.

You edit a template just like you would any other page, except that the system will force you to use the source code editor.

the final catch are the HTML tags noinclude and includeonly. Noinclude is used to say that part of the template page, such as documentation or category listings, are not part of the template. Onlyinclude specifies that the contents of the template is restricted to the contents of the tag.

Overall, it isn't really that different from editing a regular page, especially for me.