Not exact matches
I think perhaps you either stumbled across a listing that was in flux because the author has uploaded to
Pubit and they've combined listings (the whole process at
Pubit seems to involve merging listings before the Smashwords one disappears), or perhaps you've gotten ahold of of some listings
where there are other versions like a print or audio edition that did not have the description limitation.
First you need to create accounts
where you want your books to be distributed: Amazon KDP, Barnes & Noble
PubIt and Smashwords.
You can publish on it using Smashwords — and, as I suggested with
PubIt, you might want to compare your sales of short stories (or anything priced under $ 2.99) via the Smashwords premium catalog with sales directly through Amazon to see
where you get the most money for your time investment — or you can go straight to Amazon through the KDP platform.