Promote a post via Stream Administration
Click the Settings Cog.
Select Stream Administration under Posts.
Hover over a post title and click the post options ellipsis.
Select Promote.
Select a date for the promotion to end and click Promote.
Promote a post via the activity stream
Hover over the date and click the post options ellipsis.
Select Promote.
Select a date for the promotion to end and click Promote.