Switching from wordpress.com to wordpress.org

You have to download and install WordPress via your File Manager in cPanel or through an FTP client: Installing WordPress.
…or…
You can have Bluehost install for you https://www.bluehost.com/wordpress
…or…
You can read this: Moving to a Self-Hosted WordPress Site

Once installed, choose either a free WordPress theme or purchase a commercial one.

Go to your site address (…you didn’t post it) and there should be the window where you put in your site name, username, etc.
Make sure you keep your username and password somewhere so you don’t forget them.
…and DO NOT use “admin” as your default username!! Think a username and password up which will be hard to crack.