First check to make sure you are a member of the target wave:
Next, select the chart you want to move by using the listbox in the bottom left:
Next, select the wave you want to move the chart to by selecting it from the listbox right next to it on the right.
You will now see an alert box telling you the chart has been moved. Click 'OK'
Now you can go over to the target wave by selecting it from the top listbox and see the new chart has been moved.