A space stream (see screen shot 1) displays the Editorials having a specific tag, ordered by date. The needed tag is generally the one of your entity (e.g. "Silica", "Human Resource)

If your article doesn't appear in this stream, you maybe first need to retrieve your editorial page, to be able to check the following points (see screen shot 2):

• Did you updated your Editorial date? Maybe you didn't updated the date, and hold the default one.
• Did you tagged the Editorial with your entity keyword?
• If the non appearing concerns the Live, did you simply published the Editorial page in Live?

The following screen cast also show how to check which tag(s) are needed to get your news displayed in your space news stream: