Questions can be managed by moderators.
The moderation settings can be modified in the Activity management module -> Moderation settings. There you can enable/disable Question moderation & Group chat moderation.
In the app, the question management feature looks like the screenshot below. You can choose to approve or reject a question, and you can also modify it.
Approved questions will be moved to the published tab, while the rejected ones will be moved to the rejected tab.
Access to moderation rights (moderator) can be granted via the Activity management module -> Activities -> selecting a specific activity / session -> Participants tab -> Actions menu of a participant -> Add as moderator.