Log in to your admin panel and go to system>Localization> stock status. Obviously, all Stock statuses are already on the list, if you need can add more!
Note: The only problem with deleting stock status is that stock status information will be deleted along with it.
You can edit the Stock status by clicking the edit pencil button.
Then product stock list will be available on the Product add/edit --> Data tab ---> Stock status list, There you can choose the status of stock
Well! The result of product stock status updated can be seen in the screenshot below
Congratulations!!! Now your product stock level is readily visible to the public, which will help your customers make informed decisions to purchase.