The portal that will be available for individuals who have already filed, but whose information is incorrect or not on file with the IRS is not yet available. It is expected to be available mid-April. It is expected to be part of the "Where is my payment" tool that will be available on the IRS website.
Keep an eye on the following links for updates:
IRS Coronavirus Tax Relief
TurboTax Corona Virus Tax Center Updates
Safeguard your information. Do not click on links in any e-mail sent to you asking for your bank information. Go directly to IRS or US Treasury websites to provide this information.
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