1. First, remember that you can only trade duplicate stickers — these are flagged with a special mark that shows how many of them you have;
2. Select a sticker you want to send to another player and tap the Send to Friends button;
3. Select a player from your friend list and tap Send;
4. Congratulations, you've just sent a sticker! Now the other player just has to accept it;
5. To accept a sticker, open your mail in the Collections window;
6. Accept the offered sticker to add it to your Collection, or reject it if you don't need it;

You can also join our official sticker trading group, where you’ll find offers and requests from other players: https://www.facebook.com/groups/zombieminertrading