Dear Kai Lun Chan,
Hello, my name is Sherry. I will be happy to assist you with your question regarding your PayPal account.
I understand that you have some difficulties to create donation buttons on your website.
Upon checking your PayPal account, I find that the PayPal account you created is a Singaporean one. Due to the local financial control, Singaporean Users can not create Donation Buttons currently.
I am so sorry for the inconvenience.
If you need any other further assistance, please do not hesitate to contact us.
It is my pleasure to assist you. Thank you for choosing PayPal.
PayPal, an eBay Company