Make sure the website address link must be apple.com/sg
Find iPad tab and press buy now
Select white color iPad mini and select wifi+cellular, make sure the total will be $618
Follow above statement and type it.
When you finish press add engraving
Make sure everything none
Total will be $618 and press add to cart
Make sure total $618 and press check out now
Press continue under guest checkout
Key in your detail
And lastly press continue and it should bring you to payment page, key in your debit card info there.
And remember mark down the order number after you successful order it, thanks Peii.
The creator of this guide has not included tools