HOW I FOUND STICKERS: – Monument Valley Stickers Review

Open messenger. Go to where you would begin to type a message and tap the "A". At the bottom on the left there are 4 dots. Tap the dots then chose "store". Then choose "manage" tab. Scroll down to find "Monument" and turn it on. Not exactly intuitive but it worked for me.
Review by Pistol Grips on Monument Valley Stickers.