I have added 3 alert conditions: an alert when the wave top is confirmed, an alert when the wave bottom is confirmed and, an alert when either a wave top or wave bottom is confirmed.
Use the alert dialogue box - see the alarm clock pic along the top of the screen. Choose Weis wave in the topmost "Condition" dialogue box and then select one of the three options in the dialogue box immediately below the "Condition" box. ie a bottom confirmed, a top confirmed or, a top or bottom confirmed. Under options choose "Once per bar close". You only want a signal when the bar closes.