Noob Question i dowloaded ardour and i dont hear any sound coming from it

Help I dowloaded linux ardour and i dont hear sound coming from it i have no idea how to work the jack program if anyone can please take to the to give me a detailed instruction on how to do this that would be great and by the way i have a dell demension 5150

maybe have a look here:

That helped me when I was a Linux beginner.