Drupal is an open source content management system which supports pluggable modules which enable additional behaviors. The modules available for Drupal provide a wide assortment of features, including e-commerce systems, photo galleries, mailing list management, and CVS integration.
To install Drupal under your domain, Please follow the following steps :-
1) Login to Plesk 9.x control Panel.
2) Click on Domains.
3) Click on Domain name under which you want to install this application.
4) Click on " Web Application" icon.
5) Click on "Install Web Application".
6) Enter Drupal in the search box and clik on "Search".
7) Now click on "Install" to start the installation.
8) Accept the License Agreement and click on Next.
9) Please enter the required details with destination directory.
Note: Please make sure to define the destination directory correctly, like /folder-name, as auto installer shall overwrite if there exists any data. If you wish to install this application to the root of the domain, just mention the directory name as / and then click on "Install".
10) Click on "Install".
11) Now you should be able to access your application via "http://yourdomain.com/folder-name" please replace yourdomain.com with your actual domain and the folder-name with the folder mentioned by you at the time of installation.