If you would like to enable auto top-up, check out this article.
Tap on the Setel top-up button on the top left.
You will be given a choice of top-up amounts. Tap on your preferred amount.
Your preset amounts may vary from the example image due to Setel intelligently customizing them based on your preferences.
The available top-up methods will be displayed. If you have previously added a credit or debit card, they will also be displayed here.
Choose your preferred method, then tap Top-Up Now.