thank you for your questions. We know that it can be a bit challenging to get started with KlickerUZH in the beginning, wherefore I’d also like to refer to the documentation on our website in case you have not found it already anyways: Welcome | KlickerUZH. It includes a number of helpful videos for the most important workflows.
To assign a live quiz to a course, you can simply select the corresponding course during the creation of the live quiz (the course has to be created before). This step is also illustrated in the corresponding explanatory video, which should still be helpful to get started, even though the user interface has already evolved a bit in the meantime.
Re-using or restarting quizzes without duplicating them is not possible in Klicker, unless you cancel/abort the session. However, we do not recommend using the cancellation function for this use case, since all results (accessible through the evaluation view) and points collected by your students in gamified courses will be deleted. In case you simply want to keep your list of live quizzes well-organized, we would recommend that you delete past live quizzes once the course has ended or access them directly through the corresponding course overview after assigning them.
I hope these answers solve your questions, and please feel free to reach out again, should anything remain unclear.