Prerequisites

You need access and appropriate permissions to complete the quick start steps.

Access to a Developer Edition organization.
If you are not already a member of the Force.com developer community, go to developer.salesforce.com/signup and follow the instructions for signing up for a Developer Edition organization. Even if you already have Enterprise Edition, Unlimited Edition, or Performance Edition, use Developer Edition for developing, staging, and testing your solutions against sample data to protect your organization’s live data. This is especially true for applications that insert, update, or delete data (as opposed to simply reading data).
The “API Enabled” permission must be enabled for your Developer Edition organization. This permission is enabled by default, but may have been changed by an administrator.
The “Streaming API” permission must be enabled.
To verify that the “API Enabled” and “Streaming API” permissions are enabled in your organization, from Setup, enter User Interface in the Quick Find box, then select User Interface.
Note
The logged-in user must have “Read” permission on the PushTopic standard object to receive notifications.
The logged-in user must have “Create” permission on the PushTopic standard object to create and manage PushTopic records.
The logged-in user must have “Author Apex” permissions to create a PushTopic by using the Developer Console.

Force.com Streaming API Developer Guide