Use a Datastream in the Mobile App
Now you can go your mobile app and use Datastreams in widgets. Created Datastreams will already be there and you should just choose which one to choose during the widget configuration.
Important: When you create a Template from the mobile app, a set of 10 Datastreams are created by default. They are of Virtual Pin type, and data type is String. You can use them straight away or go to the Blynk.Console and configure them for your needs.