If you are asking about the monthly child tax credit payments, use the portal on the IRS site that was given to you above. As for any more "stimulus" payments---Congress has not passed any more stimulus payments.
The only way to change banking information for your tax refund is to change it when you are ready to file your next one---the 2021 return. When you go through the FILE section you will be able to change banking information for the direct deposit for a 2021 tax refund. That is the only time any banking information will be transmitted to the IRS.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
