While WordPress is not automatically built-in to JustHost, it is available for installation. Here is their instructions on how to install WordPress for JustHost:

We provide a program which makes it very easy to install third party scripts to your hosting account. If you want your website to have a WordPress blog, you can use Marketplace to install WordPress to the root of your site or to a subdirectory.

Installing WordPress with Marketplace

  1. Log in to your Just Host cPanel account.
  2. Find the Website section and select Install WordPress.
  3. Click the Install button.
    Start a brand new installation
  4. Choose the domain name to install it to.
    Select installation domain

    In the field next to the domain, you can enter a subfolder such as ‘blog’ or leave it blank if you want the site’s main page to be the blog.

  5. If necessary, you can edit the email address, username and password for the new WordPress installation. Click “advanced options” and you can change those settings.
  6. Read through the license and service agreements and check the boxes.
  7. Select the Install Now button.

For more information on JustHost, check out the following videos: