Pay off a debt sooner by making a one-time,
Click Planning Tools, and then click
In the left pane, click Loans & debt.
Click the loan(An agreement
to borrow or lend money, usually with an interest charge on the
amount borrowed.) to which you want to make an extra
payment, and then click Edit.
Click Create a One-time Payment.
Enter the amount you want to pay and when you want to pay it,
and then click OK.
To set up a recurring extra payment, follow steps 1 - 4 above,
and then click I pay an extra. Enter the
additional amount you want to pay and whether it's per payment or
per year, and then click Finish.