First of all scroll down to the Softaculous apps installer section and click on the WordPress W icon under Scripts:

Then, click on the INSTALL button

Then, you will land on the WordPress installation page.
Choose protocol:
You will choose either https or
Choose domain:
Choose the domain that will be used to access the website.
In Directory:
For some reasons, Softaculous always populates a directory by default. If you want to install your website at the Root of your domain, delete the content of the field (usually wp for a wordpress intallation). if you don’t clear the field, it will install your website at http://yourdomain.com/wp
Site name & description:
Those fields will be copied to the wordpress website during the installation process.
Enable Multisite (WPMU):
It is a special feature from wordpress to allow you to install several websites under the same domain with the same theme and the same list of plugins. It is useful for those who want to create a multi lingual websites with different subdomains and sub directories like http://yourdomain.com/es/ http://yourdomain.com/fr/ or http://es.yourdomain.com and http://fr.yourdomain.com
Admin account:
Everything here will be copied to the wordpress website. That’s also the credentials that you will use to access the administration of your wordpress website at http://yourdomain.com/wp-admin
Choose language:
You can install WordPress in another language: French, German, Spanish, Chinese and many more. After this change, the WordPress administration area wil be in the selected language.
Select plugins:
This plugin (loginizer) is important nowadays. It limits login attempts at your wordpress administration login page. If you lock you out, you can go to the file manager, to the plugins folder and rename the plugin to deactivate it. It is perfect to protect your website against bruteforce attacks and people who try to guess your password.
Advanced options:
It allows you to install wordpress on a remote mysql database. It also allows you to auto update the wordpress version, the plugins version & the themes automatically. We didn’t notice any problems with wordpress version upgrades.
Important note about auto-update of plugins:
updating the plugins automatically is a sensitive task. Most of the time, on WordPress installations, problems are related to the plugins. It is better to manually update plugins and check that the website is working well.
Important note about auto-update of themes:
If you have modify your theme, your changes will be deleted during update. That’s why i recommend to activate this option only if you have created a Child theme.
Backup:
You can also activate the auto-backup option from here. Note that the Cpanel backup isn’t automated.
Theme:
Choose a theme for your wordpress installation. It is not mandatory. After installation, you will be able to choose a theme from the wordpress repository.
Now click on Install.