On each question page, you can place as many questions as you want, except the welcome and final page. Through the settings you can disable the welcome and final page if you don't want to show those.
Please proceed as follows, to add a new question:
Navigate to the page where you want to insert the question
Click at the bottom of the page the green + button and select 'Question'
Select the desired question type, and create the question
Options
Each question type has different settings and options. The options are described here in the Help Center at the individual question types.