You will be required to first apply for a UAPass account at the online UA Portal. The processing time of the UAPass takes about 5 working days. Therefore, it is recommended that you apply for your UAPass account prior to your visit to Singapore.
Thereafter, you can purchase the registration label over-the-counter at designated SingPost outlets. For over-the-counter purchase, the following is required:
Completed physical copy of the UA Registration Label Purchase Form; and
Original and photocopy of your Passport.
You may also purchase the registration label online. However, you will need a local address as the delivery is only within Singapore.
After you have affixed the registration label on your UA, login to the online UA Portal with your UAPass account to complete the registration.