At the top of your bucket shelf, click the +cloud icon to create a new streaming bucket.
Name the new bucket (e.g. Trigger Test). You can optionally configure the bucket key and access key used by clicking on the "Configure Endpoint Keys" checkbox.
Click the "Create" button at the bottom and the new bucket should be listed at the top of your shelf.
Related: You can send data to your newly created bucket via a simple URL - http://support.initialstate.com/knowledgebase/articles/842139-how-to-stream-events-via-url-parameters