With overlays that make it look like you are blowing glitter or confetti, it's important that you use the right image. They won't work on all images.
You will need one where your main subject is already looking like they are blowing something out of their hands. This can be face forward, or to the side.
This video will show you how to use the confetti heart overlays on an image.
If you are using blowing glitter overlays, they will work the same. However, you will need to change the blending mode in photoshop to SCREEN. This will remove the black background.