Load your theme
Open index.php then change the load() .json data file path and the tpl::parse() .html template file path to match with yours. You can load or parse more than one file by duplicating the lines.
If you want to create a separate page, copy paste the index.php file in the same directory then edit the file name and the data and template files path.
From now on, links between pages must call .php root files.