How to send a sticker?
If you want to share a cool sticker with a friend, choose the sticker pack you like and click the "Install" button. Then, in the messenger that opens, the selected stickers pack will be displayed with an option to add new stickers. Next, go to the chat with the person you want to share your stickers with, and in the lower part of the screen, click on the icon located to the left of the message entry field. You will see the last added stickers in the pop-up window.