Log into Plesk control panel on your dedicated or cloud server.
1. If you are logged into the power user console go to step 4, if you have logged into the Server Administration Panel click on the Domains link under Hosting Services in the left hand menu bar.
2. Click on the Open in Control Panel link next to the domain name you wish to install WordPress for.
3. Now you are in the Power User View, click on the Applications tab link next to the domain name you wish to install WordPress for.
4. Click on the All Available Applications section in the left hand menu. Then in the Application search box type WordPress and press the Search button.
5. Click on the Install button for the WordPress instance called WordPress X.X.X.