Do you mean you started a Schedule D (or it carried over from last year), but you do not need it? The program automatically creates it when you enter the sale of assets.
Are you trying to delete Schedule D because you want to use a lower version of TurboTax Online instead of Premier? If so, see the following FAQ. But if you have a sale of investments, real estate (including your home), or other assets, you have to use TurboTax Online Premier or higher, or any version of the CD/Download TurboTax software.
If the Scheduled is no longer needed due to eliminating of company or something if you view form (click on form when in step by step) at the bottom of page you can choose delete. Just make sure this form is no longer needed