It is possible to have the text and the multiple-choice questions side by side. To do that you need to use the "reading text" field in JQuiz. Make sure "Multiple choice" is selected on the right: see the screenshot below. Here's an example with a grammar explanation in the reading text field on the left and the multiple choice questions on the right: at - to
When you have a problem like this, have you tried using Google? Try for example "Hot Potatoes tutorial reading text". As well as the "official" tutorials Mary's already provided a link to, many other people have created tutorials too.