After you added an RD Session Host, you can publish applications from it.
To publish an application:
In the Parallels RAS Console, select the Start category and click the Publish Applications item in the right pane.
The Publish Applications wizard opens. On the first page, select one or more servers from which the application should be published. You can select all servers, server host pools, or individual servers.
Click Next.
On the next page, select one or more applications you want to publish.
If you've selected more than one server on the previous screen, the Show applications not available on all target servers option becomes enabled. If the option is cleared (default), the folder tree will contain applications that are available on each and every server that you selected. If the option is enabled, the tree will contain applications that may be available on some server(s), but not on the others.
Click Next. Review the summary information and click Next again.
Click Finish when ready.
To verify that an application has been successfully published, select the Publishing category in the RAS Console. The application should be included in the Published Resources list (the middle pane).