From the dashboard, as a vendor, you are able to select product, mouse over the product name and select edit, where you will be able to add more information about your product. If you want to create the product and add another one immediately, click on the Create & add new button.

After you have been directed to the product edit page, there is an option to select a product type and enter the details of description. You can also edit the Attribute and Variation, then save the variation.