Open Snapchat and take or upload a photo
Tap the sticker icon on the right side of the screen
Choose a sticker from the sticker tray
To make a custom sticker, tap the scissors icon
Outline the part of the image you want to turn into a sticker
Release to save the cutout as a sticker
Tap the sticker icon again to find your saved sticker
Drag the sticker onto your Snap
Resize or rotate the sticker with two fingers
Send or save your Snap with the sticker added