I’ve followed the video but still having problem with installing Prosper202 on HostGator. When I go to my domain name (after uploading files to the server) it refers me straight to my website. Any idea why?

Prosper202 needs to run in the root of the domain or sub domain all by itself... It won't run with word press or another website in the root of the domain. If you don't want to have a dedicated tracking domain then you need to install Prosper202 in a sub domain so it will function properly.