Link domain to hosting. In order to do this go to hosting subscriptions list and click Actions > Websites & Domains > Link To Domain > PHP Website.

Once domain is linked to hosting you will see Install Application button in Websites & Domains.

Click Install Application > Wordpress

Choose Wordpress version

If this is not first installation or installation folder is not empty you can select Clear folder before installation checkbox

New database will be automatically created. If you need to link your wordpress to already existing database then choose Use existing database option and fill in required connection details.

Click Install button and do not close page till Wordpress is intalled.

Once Wordpress is installed you can navigate to you website and proceed with setup using standard Wordpress admin tools.