If you are using the PAU04 on a Windows machine to create a hotspot (Access Point), you are likely using the "Realtek USB Wireless LAN Utility" or the "Panda Wireless Utility" that comes with the drivers.
Wait a few seconds for the device to authenticate and establish a secure link. Scenario 2: Changing the Password in AP (Hotspot) Mode Change WiFi Password In Panda Wireless PAU04