You can access the AeroGear UnifiedPush Server Administration Console via the following URL. Temporarily, there is an "admin:123" user. You will need to change this password when you first log in. Check out the Administration Console user guide for more information about the console.
The AeroGear UnifiedPush Server and the AeroGear SimplePush Server persist all data to the MySQL database that's been added to your application's gear.
For more information about the downloadable cartridge, check out the cartridge documentation.
The AeroGear Push Server OpenShift cartridge will soon be available directly from OpenShift Online. Stay tuned for that! In the meantime, we encourage you to provide feedback on the downloadable cartridge via our mailing list.