To use VOIP you will need to have a headset (with microphone and earphones) or have a computer with a built in microphone and speakers.
At least one person in your VOIP session needs to have purchased a license of Yuuguu, or be on a trial in order for VOIP to work.
Starting a VOIP call on Yuuguu
To do this:
Click on the person in your contacts list and your session window will open up on the right hand side.
Click on call in the blue bar to reveal your options.
Your contact will receive a pop-up message to accept your call like this.
The call will start when they accept your request. You can end it at any time by pressing end.