When you first log in you will see an empty questions list. You can create a new question by clicking the "Create your first poll" button in the center or "Create poll" on the left-hand side.
You will see a tab with 3 question types:
Multiple choice (poll)
Open-ended (for Q&A sessions and many more)
Word cloud (relative popularity of responses among the audience)
Select one of the question types and proceed to create your question.
Once you are done, click the "Launch" button or "Save & New Poll".
Now your audience can start participating!