Question Writer Manual/Quiz Options/Quiz Details/Title
Enter the name of your quiz in the quiz title box. You can change this (and any other of the properties later if you change your mind).
The title will usually appear at the top of the page throughout your quiz. You can opt to stop the title from appearing on every page by unticking a box in General Question Properties
The title can also be used to identify your quiz if you're using the online results server to collect responses and scores.