StreamOnce setup involves adding a stream to the Activity page of a place you own.
To set up any of the StreamOnce endpoints, you'll add a stream to a Place template for a group that you own (or are the administrator for). When you add a stream, you'll be able to configure the stream with the correct connection information. This edition of the documentation provides a more detailed configuration for email integrations only.
Note: StreamOnce is licensed on a per-user basis. Before you start using it, talk to your community manager.
Here are the steps: