XF 2.0 Adding additional footer links

I want to add a link to a custom page but I don't know how to add the code on the template. Here is the code for the Terms and Rules link, but how do I replace the variables xf.tosUrl for a custom page?

<xf:if is="$xf.tosUrl">
<li><a href="{$xf.tosUrl}">{{ phrase('terms_and_rules') }}</a></li>
</xf:if>
 
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