Step By Step Guide to Adding Pages to Site

[login to view URL] - I bought this site as a template about a year ago. The seller seems unable to advise how I can add pages to it that I can link from the main page e.g. <a href="/terms">Privacy policy and terms</a> The key file appears to be an index file but I have not managed to successfully add a page. <div class="left_articles"> {if $[login to view URL] == 'advertise'} {include file="[login to view URL]"} {elseif $[login to view URL] == 'contact'} {include file="[login to view URL]"} {elseif $[login to view URL] == 'submit'} {include file="[login to view URL]"} {elseif $[login to view URL] == 'terms'} {include file="[login to view URL]"} {elseif $[login to view URL] == 'iran'} {include file="[login to view URL]"} {elseif $[login to view URL] == 'paypal'} {include file="[login to view URL]"} {elseif $[login to view URL] == 'proxy'} {include file="[login to view URL]"} {elseif $[login to view URL] == 'viewed'} {include file="[login to view URL]"} {elseif $[login to view URL] == 'categories'} {include file="[login to view URL]"} {elseif $[login to view URL] == 'visited'} {include file="[login to view URL]"} {elseif $[login to view URL] == 'added'} {include file="[login to view URL]"} {else} {include file="[login to view URL]"} The project - give me a step by step instruction as to how to set up a page.