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Registrants with a completed SAM entity record can update their D&B information by going to their site at http://fedgov.dnb.com/webform. Updates can take up to two hours to process on the D&B website. The changes will be visible in SAM 24 hours after they have been made at D&B. If after 24 hours you hours they do not see the changes, you  they can manually update your their information by following the steps below:

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Step 3: Select the entity record that you want they want to update and click the “Update” button.

Step 4: Click the “Refresh D&B” button on the “Verify DUNS” page to view and accept your accept their D&B information.

If this did not answer your question, please refer to the Federal Service Desk (FSD) website at https://www.fsd.gov and enter your question in the search box.