There are 5 things you can do as a moderator:
Speak: This is a text message to the group that should be used to convey things to the group that are not questions, such as introducing the topic, or reacting to the group's responses.
Example: Today we will be talking about a concept for a new product, and I'll be showing you 3 images to get your reactions.
Ask: This is an open-ended question.
Example: What is your reaction to the image of the product above?
Poll: This is a closed-ended poll (Single or Multi-Select) question.
Example: Which of the product ideas do you like best?