A top up simply means adding money to your account so you have enough balance to cover any upcoming payments.

👉🏻 TopUp your Account by clicking on the plus icon (GIF below)

auto top up - UPDATED smaller .gif

👉🏻 Enter Configure Auto TopUp below the button

👉🏻 Select Auto TopUp and amount

👉🏻 Add your payment information

👉🏻 Good to go