Add Signin-Registration in Wordpress site

Here is the link of the site [login to view URL] It is already converted to WP. There is also a page that on there - [login to view URL] that will have links to a video. This page was original a sign-in page. Meaning, you would have to register and sign-up with [login to view URL] to view the videos. If someone who wasn't signed-in clicked on a link to a video, it would redirect you to a sign-in page. I have already installed wordpress at this location - [login to view URL] but eventually I would like [login to view URL] site to point to the wordpress site without the additional "/wordpress" in the URL. I hope that makes sense. I don't want to spend over $50 for this project. I want it ASAP. Thanks