#1: Join on Mute: the easiest thing to do it join "muted" without a headset. The is the default setting and you'll go into the meeting on mute but able to hear the meeting via the speaker.
#2: Before you join, plug in your VoIP headset: then you can join where it says, "Call via iPad" - that's VoIP only.
Need more help? Have more questions?
From the iPad, you can join a Live Demo and get more answers. Just start the application and you can jump on! [See the last button below - it appears on your app start-up screen for WebEx.]