You can't change it on your tax forms since you have filed. You can update your account.
In order to change your phone number in Turbo Tax Online, please follow these instructions.
*While you are signed in to Turbo Tax, on the bottom left, click on Intuit Account.
*Locate the Phone section and click on EDIT.
*Next to your phone number, click the work Change.
*Change your phone number and enter your password again. This will change your phone number.
**Mark the post that answers your question by clicking on "Mark as Best Answer"