In Tutoom only Moderators have full permissions to use the platform.

To convert participants you must be a Moderator of the session.

Follow these steps:

Go to Participants in the navigation bar.

Click on the user's name.

Click on Convert to Moderator.

There can be more than one Moderator in the session.
For a Moderator to use the whiteboard they must have Presenter Mode enabled.
It does not apply to Rooms because all users become Moderators.