To postpone due date you go to Loans->Postpone due dates and a screen as follows will be displayed:
1. Open the Postpone Due Dates dialog from the Loans menu.
Loan Number: Enter the loan number that you wish to change the due dates or click on the Choose command button to select it from the list in the "Loan Number" table that shows up.
3. The main screen is updated with the due date of the first installment (First installment is due on:)
4. Enter the number of days you want to postpone the repayment dates of this loan into Update due dates with how many days? text box.