Top-ups are in the brand dashboard, the "Balance" section.
Enter the amount, choose a payment method and confirm. Funds are credited once the payment provider confirms the payment — usually immediately, though a delay on the bank's side can add a few minutes.
The full top-up history is kept in "Balance" and can be exported as a file for your accounting.
Money on the balance can only be spent on campaigns inside the platform. When a campaign closes, the unspent reserve returns to the balance and is used in the next one.