Launch the Remote Desktop app. Click "Add" in the top right corner, and select "Desktop"
For PC name, enter the computer name, computername.stl.umsl.edu
The Remote Desktop app does not currently work with the RD Gateway. (This could be resolved in a future version.) Instead of configuring a gateway, click Save
Click the newly-created desktop
When prompted for a username, enter as ssoid@umsystem.edu
If prompted to accept a certificate, click Connect