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Tutorial 1
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How to edit picture according to the shapes :

1. Double click on smart object layer (Photos > Image > PLACE YOUR IMAGES HERE!).
2. Click Ok.
3. Drag your picture from your library to Photoshop.
4. Fit the Picture.
5. Save the .psb windows and close it.
6. if it can't be saved, you should right click the layer and then choose flatten image. so all layer will be merged.
7. Save again, then close the .psb window

You can also learn in this video = https://www.youtube.com/watch?v=G217IDs3ZnI

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Tutorial 2
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Change images on Adobe Photoshop

1. Find the smart object "insert image here" layer
2. Double click on the smart object thumbnail
3. insert your image to .psb file and don't forget to save.
4. if it can't be saved, you should right click the layer and then choose flatten image. so all layer will be merged.
5. Save again, then close the .psb window