Aria, the promote a story forum is for promoting only your own stories.
But, if you want to let others know about stories by other authors, you can add those stories to your "recommended reading" page, on your Archive profile.
I am not entirely sure if we have any place for promoting stories by other authors on the forum. I'll have to look into it and get back to you on that.
Willow Darkling, Forum Moderator.