Before you start installing a new CMS, you should take care of the following:
Have an empty folder in your repository where you will perform the installation
Create a new empty database
To start the installation, select the logo of the CMS system you want to use, then you just have to select it:
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Go to Web domain settings/SSL setting. Here, under New virtual host, you can select which domain name should point to which folder (in case of a folder name that does not exist, the folder will be created on the server). Once saved, the modification will be completed within 10 minutes.
By entering MySQL (database) settings at the bottom of the page you can create a new empty database. This will be available on the server in 10 minutes, after which you can start the installation.