I belive I messed us the stimulus how do I fix it

It depends.  You may or may not need to make a change to the return you submitted.

If your e-filed return is rejected, you'll be able to make any changes related to the Recovery Rebate Credit.

If your e-filed return is accepted, you can't make changes to your original return.

But... when you receive the refund for your original return, you'll be able to figure out whether the amount of the Recovery Rebate Credit that you actually received as part of your refund was based on what you entered on your return, or not. 

It's possible that the IRS will already have made the correction during processing, and adjusted your refund accordingly.  If that's the case, the IRS will send you a notice telling you they've made the correction, and you won't need to amend your original return. 

If you do need to amend, please see the TurboTax Help article How to amend (change or correct) a return you already filed for instruction on how to amend your previously-filed tax return.

The IRS requires you to report all relevant stimulus information when you’re filing your return.