Step 1: open a square image from your camera roll.
Step 2: click on the new layer button from the tools menu at the bottom.
Step 3: select the blank layer option. (Which looks like a dotted square)
Step 4: click on the bar at the bottom of the full menu. Slide the alpha slider all the way up to 1. (You can change the color if you want, aswell) Click the checkmark in the top left to submit.
Step 5: make a new layer. This time choosing the picture icon. Here we will import our new image that we want to display.
Step 7: the layer placement menu pops up. At this point it’s best to lock the rotate and translate functions by clicking on the buttons.
Step 8: scale your image down using a pinch gesture. (I usually keep one finger still and slide or “pinch” with the other. It’s more refined) Click on the checkmark when complete.
Step 9: click flatten at the top of the layers menu.
Step 10: press the cloud icon in the top right and choose export to photo album.