Oh hey! I'm so sorry, I didn't see that reply you posted, then I realised it was written one month ago. Damn, I'm sorry about that.
Though, if isn't too late, here's how you add a description:
1) Go to the 'Create' button which is on the top bar next to 'Community' and the 'Discover' search bar.
2) Next to your story, you will see a 'Manage.' Click on that.
3) A pop-up box will open. In it, the SECOND text box will be labelled 'Description'. There, you can type in what would usually sell as a book blurb.
Hope that helped. Message me if you need anything else.
And yes, I will gladly go through your story. (It's so rare someone asks me to read something! I'm so excited! :D)