For using this stickers in iOS 10 open Messeges app and:
1) Tap the arrow button on the left of texting area
2) Tap the app button and then tap the 4 dots button on the bottom.
3) Tap the icon of the stickers and you can start to use them! ;)
!!! If you can't find stickers after installing in iMessage dock, you just need to make them "on" in Manage tab in iMessage store.

If you have more questions you can contact me through Facebook, hitting support button.

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© Creation and development stickers — Svetlana Tokarenko
facebook.com/svetatokarenko