This is the Nav item template. It should be called in the following format:
{{Nav item |Type= < Text / Link > |Item=pagename*text or pagename (for type=Link) or text (for type=Text) |Add text= optional extra text that is added after the text from "Item" parameter }}
instead of pagename, you can also use URL:<url of page>, this url will be directly used for the "href" parameter in widget:Link, instead of using {{fullurl:<pagename>}}
Example