Download and launch PoshLight app.
Tap the "Camera" button.
Take a picture of your palms.
Tap the "Add Effects" button. If this is the first launch of the app, it might take a while to download images. So if you do not see "Galaxy" pack, tap the red "X", wait for a minute, then try again..
Tap "Galaxy" icon, then you see a list of galaxy images.
Tap on your favorite one.
Tap "Move" button, move and pinch zoom so that most of the galaxy is inside your palms. Move "Strength" slider to around 70% or 80%. Then tap the green check button.
Tap "Mask" button, then select the black dot with white background button. You will now see a circle with 5 dots displayed around the center of screen.
The circle is used to shape/cut the galaxy image. Drag the dots fit the galaxy in the palms.
Tap green check button.
You can tap the "Blend mode" button and play with different blend modes. You might get some interesting results. In this tutorial, the default blend mode works fine. Tap "Done" button.
Now you can save the picture to Camera Roll, and share to your friends to get some wows and likes.