To open the stickers menu, tap on the smiley face button in the Chat tab. Choose the sticker you want from the menu that pops up, tap on it, and your sticker message will show up in the guild chat.

Recently used

🕑 In this tab, you can see up to 8 of your most recently used stickers.

Favorites

⭐ In this tab, you can see up to 8 stickers that you've marked with a star.

✅ To add a sticker to your Favorites, tap and hold it down. Then tap on the star that appears.

❎ To remove a sticker from your Favorites, tap and hold it down. Then tap on the star that appears.