To access the voting, onsite participants should use the button "interactive voting" which is available in the App Menu:
You can also use the following link: https://voteers.conference2web.com/?token=q1ZKLUvNK4nPTFGyUjI1MlGqBQA%3D
Online participants should use the polling button which is on the right hand side of the presentation, as shown in the screenshot below:
Please note that the button is active only when there is a voting during the session. You should also make sure that you are not watching the presentation in full screen.
Note that the voting link is also accessible from the home page: