Access the Webcast screen
Click the Settings tab
Click the Pause Auction button
Confirm this action by clicking on the Pause Auction Now button that will have appeared on the top left of the screen - as seen below:
Bidders will be shown a message to let them know that the auction/bidding is paused:
Resume the auction by clicking on the Resume Auction button that will have appeared on the top left of the screen
It is not possible to undo or cancel a bid while the auction is paused.