The questions and possible answers are offered e.g. via a white board/pinboard.
The answers need to be lettered (e.g. A, B, C...).
Start the vote/evaluation/feedback in the app by setting up the number of possible answers (e.g. 3) and hand the device around in the group.
Once everyone voted the evaluation is stopped by pressing 3x back followed by 3x menu key.
The results are summarized and a new vote can start.
No need for an account or long lasting preparations to insert questions and answers in a tool.