In case you want to delete an application (e.g. WordPress, Joomla) that you have installed in Plesk, follow the instructions described below:
1. Log into myTophost Panel and click on Plesk Login in order to connect to the Plesk of the plan that you are interested in.
2. Click on Applications in the left vertical column.
3. On the right-hand side of each installed application, you will have the possibility to disable it by clicking on Remove.