Memeoji Stickes

Have you updated to iOS 13.1.2?

Step #1: Open the Messages app and select an existing message or start a new one

Step #2: Tap on the text field

Step #3: Tap the smiley face emoji in the bottom left corner

Step #4: Tap on Memoji Stickers and choose one

Step #5: Now You can access Memoji Stickers from the Messages App Strip as well as from the frequently used emoji section

If you click on the 3 dots you can add and remove stickers