Pusheen? Is that you? No.. just a fat cat, being lazy as usual, who happens to be grey, found on the road side.
To start using FAtCAt in iMessage:
Step 1: Open a message with a friend and tap ">" button to the left to the text box
Step 2: Tap the app button that appears (it looks like an "A") and then tap the button the button in the lower left (looks like four circles). This opens up the iMessage app drawer.
Step 3: Tap FAtCAt icon to start sending stickers
Tips & tricks in sending stickers:
* Tap to send sticker as emoji
* Touch and hold to peel off the sticker. Then, move it around to stick them on top of speech bubbles, other stickers or photos.