The sale of your stock was reported to you on form 1099-B. This is the form that you will use to report the sale of your stock on your tax return. You do not have to do anything with Form 8949.
From your question it appears that the form does not have an entry in box 1e cost or other basis. When you obtain the cost basis then you will enter this information when you complete Form 1099-B as well as the purchase date, sale date, and proceedes from the sale.
This TurboTax link Where do I enter a 1099-B? has directions on how to enter data into Form 1099-B
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
