First navigate to the WordPress option in the Softaculous Apps Installer. You should see the following screen:
You will then be prompted to enter setup details, such as the domain to be installed on, the site name, and the administrator login details:
Here you can also select the theme you want to use, however this can also be done at a later time.
Once the installation finishes, you will be given a login URL for you to access the WordPress Dashboard.