Open Snapchat and go to the chat or Snap where the sticker is placed
Tap and hold the sticker you want to remove
Drag the sticker to the trash icon or Delete icon that appears
Release it to delete the sticker
If the sticker is on a saved Snap or Story, open the edit screen first and remove it there
If you want to remove a sticker from your sticker favorites, open the sticker panel, press and hold the sticker, then tap Remove from Favorites if available