30+ greatest stickers for iMessage. Chief cat is the best sticker pack app for all the person who love send messages around the world! Enjoy your everyday life, make your conversations more exciting and bold with Chief cat! It will make your Messages chat interesting and fun. Express yourself in richer ways with this stickers that can be used within your conversations on iMessage. How to use iMessage stickers: - Click the App Store icon next to the message field in iMessage; - click on the icon in the lower left corner; - click on the sticker icon; - after that, you can send stickers in empty iMessage messages, as well as add stickers to your already sent and other people's messages. To do this, press and hold the selected sticker and drag it to the message. You can, put several stickers on one message at once, and also use the message appearance effects in iMessage.