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In the SAP command prompt , Enter transaction PA30

In the next SAP screen,

1. Enter the Personnel number
2. Click the Enter Button

1. Select the relevant Tab to view related Infotypes.
2. Select the Infotype you wish to change.

Click the change button

In the next SAP screen,

1. Maintain any changes to the existing Infotype fields.

Click the save button.

Record is changed!

Following in an excellent video on Infotype Modifications