The first person that claims a podcast becomes the owner, and will be the host in any live events this podcast creates. The host has special privileges in live events:
Bring audience members to the stage (if they raise their hand)
Turn a guest on stage into a speaker
Remove people from the stage
Turning a guest into a speaker allows them to also move people to and from the stage.
First press on the icon of the guest you want to remove or mute.
You will then see all the options. Select remove from stage or any other desired action.
To bring up people from the stage you'll need to access the raised hands tab at the bottom of your screen and select the person you'd like to bring up to the stage.