Where is the epidural anesthesia injected?

An epidural block is given in the lower back into a small area (the epidural space) below the spinal cord. You will be asked to sit or lie on your side with your back curved outward and to stay this way until the procedure is completed. You can move when it's done, but you may not be allowed to walk around.

Source: http://www.lifelinetomodernmedicine.com/ArticlePage.aspx?ID=e746e318-69c5-4fef-aa4d-899a827d08c0&LandingID=4f04afc4-4f77-4eff-b20c-01e6e6ede922