I logged in to the demo site and prepared a quiz.
Now, how do I access and take this quiz? I'd like to evaluate the quiz submission and evaluation options.

Regards,
Pragati.

First, the quiz should have some questions and you should publish it. You should create a menu item or insert it in the article to pass the quiz, but there's no such possibility (to create menu item and edit the articles) for users on our demo site.

So you could pass the quiz, if in browser you insert the link: demo.joomplace.com/index.php?option=com_...quiz&quiz_id=555
Paste the quiz id instead of '555'.

Try to test a quiz on our demo site, note the settings are reset once a 3 hours, so we advice you to test the features individually and don't make a big quiz.

Regards