Xiaomi getway 3

I can’t add Xiaomi binding. Try with PaperUI and org.openhab.binding.mihome-2.1.0-SNAPSHOT.jar file - nothing. In PaperUI it’s not exists.
What I need to do step by step?

UPD: I installed it with .kar file. Next question is: where I can get itemId?

You have to get the token id from your app. the this thread for more information: Mi(Xiaomi) Smart home bindings?