index.html and index.php Can These Files Coexist

Please check out my two wordpress blog on forex charting software and trailing stop blog.

These word press blogs are hosted on a traditional sales page with html files and a wordpress blog. I am facing a problem that the blog main index page could not be displayed every time i visit the main page.

When i go to https://www.forextrailer.com and https://www.forexgeometry.com websites, how do i direct them to index.php instead of index.html ?