The IRS is in the process of creating a sit
If you only want to change your Direct Deposit Information
The Treasury is expected to shortly announce an online portal where direct deposit information can be supplied to the IRS. Here is what you should do:
Go to http://www.irs.gov/newsroom/economic-impact-payments-what-you-need-to-know to see if they have set up the online portal. (This article will be updated with the web address once it’s available.)