Add new page in admin side in the code created by PHPMAKER

We have an existing CRM site done in PHP where we need to add one page to the CRM functionality. The site is currently working and all that needs to be done is the addition of the "links" page into the CRM functionality to allow admin to update the page. Website address is [login to view URL] You will need to work quickly and be able to go through existing code to determine how the current CRM is working.