If you are using Windows 7 or Windows Vista:

1. Click on Start button and open Control Panel
2. In the Control Panel, click on Hardware and Sound
3. Now click (or double-click, depending on your view mode) on Sound
4. In the Playback tab click on the device you wish to use with Messagenet Talk WebPhone
5. Now click on Properties and ensure that Use this device (enable) is selected in the Device usage drop-down list
6. (optional) Adjust volume clicking on Level tab
7. Confirm your choices clicking on OK

If you are using Windows XP (XP style):

1. Click on Start button
2. Click on Control Panel
3. Find Sounds, Speech, and Audio Devices icon and double-click on it
4. Now click on Sounds and Audio Devices
5. Click on Audio tab
6. Now you can select which audio device use with Messagenet Talk WebPhone from the Sound Playback drop-down list
7. (optional) Adjust volume clicking on Volume...
8. Confirm your choices clicking on OK

If you are using Windows XP (classic style) or Windows 2000:

1. Click on Start button
2. Open Settings menu and click on Control Panel
3. Find Sound and Audio Devices icon and double-click on it
4. Click on Audio tab
5. Now you can select which audio device use with Messagenet Talk WebPhone from the Sound Playback drop-down list
6. (optional) Adjust volume clicking on Volume...
7. Confirm your choices clicking on OK