On the left side, on top, you will see the list of prayers (written in red). For example: click on ASHREI and the text will appear in Hebrew along with a transliteration. Scroll down to the end of the prayer and on the right side there is a red arrow. Click on this arrow. It will download the music.
Then, on the left side, at the bottom, you will see a pop-up which will say "Ashrei(1)w.ma." Push on that pop-up and a black square with a musical note will appear. You will hear the music. You will have to repeat the same process for each prayer that you want to learn.