If you have an Interest-Only Mortgage, all you pay on a monthly basis is interest. You do not make any monthly repayments on your mortgage before it reaches maturity. Once your Interest-Only Mortgage reaches maturity, you are expected to repay the full loan, for instance by using your savings. If you do not have any savings, you will be left with a debt. This will cause you to have to sell your house, renew your mortgage or take out another mortgage. There may be risks associated with this.
Simply go online and visit the secure environment of Internet Banking or use the Mobile Banking app to make repayments or change your mortgage type. Remember to check your options and the consequences for your monthly expense first. Once you have done that, you can adjust your mortgage yourself: