Can I apply for a 90-day Non-O visa from Hong Kong if I have a Thai child but am not married?

But if you scroll down on this page you can fill in your Nationality

If I use my Nationality I find this: 6.2 Applicant’s family members (i.e., spouse, parents and children who are unmarried and under 20 years old) are eligible to apply for a Non-Immigrant Visa (category “O”) and will be allowed to stay for a period of 90 days but no longer than 1 year. Evidence of the certificate of Marriage and birth are required.

6.3 Supporting documents that the sponsor has sufficient funds to pay for the cost of living of the applicants (for example, copies of bank statement, bank book, tax returns etc.)