To install applications using the Softaculous tool, you need:
1) Log in to the Plesk server control panel;
2) Go to the Softaculous section;
3) If there are several domains, select the one you need for installation;
4) On the left side of the screen, select the software you need to install, for example Drupal or OpenCart;
5) On the page that opens, you can see a brief overview of the software you have chosen. Installation is carried out by clicking the "Install Now" button