The first step is to log into your account and click on "My slideshows".
Right after you have done this, select the desired slideshow and click on "Edit".
The next step is simple, you just need to click on "Next".
And now, finally, the last step is to scroll down until you see the "Audio" section. Here you will have the option to choose how you want to add your music. You can choose a track from our website or upload your own music from your computer. We will soon have the option to choose a track from YouTube, so keep in touch.