I figured it out! – Pun Pals Sticker Pack Review

Okay so y'all know that lil A looking character next to message bubble area? Click on that, then click on the lil four square looking piece and boom there they are! You just need to click on the icon and there you can see all the stickers and use them!
Review by Meowtbgn on Pun Pals Sticker Pack.