The ability to create a new session, create questions and start polling is limited to Staff only. If you are a student, you can still take part by answering polls or posting questions in the Q&A, but you can't create a new session yourself.
With Vevox, you can create polls with question types like multiple choice, and then invite your students to answer these questions. Students answer using their own web-enabled device, such as a mobile phone or laptop.
Your students can also post questions to the Q&A board and other students can upvote the questions they'd like to see answered.
Vevox doesn't have to just be used for teaching though. You can use Vevox as part of your training session, in team meetings or however you see fit.