Installing MariaDB on MyCloud PR4100

Hello !

I would like to install WordPress on MyCloud PR4100, OS version 5.09.115
For doing it I need a php version which I suppose is phpMyAdmin and I already installed it.

But I want to use MariaDB for the database and I don’t know how to. Which folder should I download on the MariaDB webpage so I can install the app manually ?

Thank you