Hello Yao Wei,
It is pleasing that you have an interest in obtaining an Ubuntu Membership.
To further this application it is required to submit your launchpad ID link. Among all the data is if/when you signed the Ubuntu Code of Conduct. Additionally it is also required that you have supporting testimonials for your Ubuntu contributions,
Please see: https://discourse.ubuntu.com/t/membership-requirements/33634
Your first steps have been taken 