Don't make any changes until your tax return is fully processed, which means you have received your refund or if you have a balance due, it's deducted from your account. If your tax return is pending, don't make any changes.
Form 1040X won't be ready until later this month. You can check when the 1040X will be available by using this link.
For more information and instructions, review the TurboTax articles How to Correct Federal Tax Returns, How to File an Amended Tax Return with the IRS and Video: How to Amend Your Tax Return.