After register, Press "Create new App" in "My Apps" panel.
Enter the "App Name", and choose the platform. "App Name" should be unique.
The new app will appear in "My Apps".
Click "Download License".
"Developer ID" and "App ID" will be shown in the application page.
Then enter the "Device ID".
Connect the Android device to PC with USB cable. Then find the "Device ID" with DpnGetDeviceID.
Enter "Device ID" and click "Confirm", then the license will be downloaded automatically.
The file names of the certificates are different for different app IDs and device IDs, which means that the same app can be issued with multiple certificates, thus running on multiple devices at the same time.