Yes you can! You can choose to make a custom payment towards one of your existing instalments. 

To do this, see the steps below:

Via the Afterpay app:

1. Log in to your Afterpay App

2. Select the “My Afterpay” tab in the bottom right corner of your screen

3. Select the “Orders” tab

4. Select the order that you wish to make a payment towards

5. Select “Make a payment” and click “Custom amount”

6. Enter in the amount that you would like to pay 

7. Submit Payment

Via the Afterpay Website:

1. Log in to your account via the Afterpay website

2. Click the “Upcoming Payments” tab

3. Click the order that you wish to make a payment towards 

4. Click “Make a payment” and select “Custom amount”

5. Enter in the amount you would like to pay

6. Submit payment