In facilitator-led experiences, you must publish content to the facilitator dashboard to allow the facilitator to control the exercise.
This is accomplished by adding an "inject". This can be done via the Design menu or right-click in the whiteboard and add inject from the pop-up menu.

The image below shows two injects published to the facilitator channel. This will appear in the facilitator dashboard’s exercise control feed.

The illustration shows:
  1. Exercise control channel
  2. Where content for players can be connected
  3. A timer of 3 minutes has been configured.
An inject attached to content block 13 will not be published until after the timer has expired.

The “Button” question type provides a single button where there is no choice except
to continue. This is commonly used to send an inject.

Setting the question type to Timer allows the scenario to unfold without intervention
from the facilitator. It’s this time that appears in the
Master Events Lists.You can also set a personal timer for the player
but it must be configured in the notification channel.