In the bottom right, you will want to find the "Installatron Applications Installer" icon:
On the next page you want to find the icon that says "WordPress blog":
On the next page you want to do the "Install this application"button:
For location I would suggest using https://domain.com without the www and without a directory (select it from the drop-down list):
For the next section, it's best if you mark the settings as follows. I recomend this to help with security updates and make maintenance easy:
For the bottom part feel free to change the admin username/password/blogname etc, but I recomend leaving "limit login attempts" on and two factor authentication off (at least until you know more about wordpress and how those things work).
From there it's just a matter of clicking the "Install+" button and watching it work, and doing what it says at the end! Good luck and happy blogging! If you need ANY help just send me an SMS or open a ticket here and we will help you!