You need to have a bank account in Singapore and a valid long-term residence permit in Singapore, such as a work permit, a student permit, or a permanent resident. Age to 18 years old.

You can go to the bank to find out, because banks do not directly handle stock transactions, but also entrust some institutions to handle them. For example, Vicker of DBS Bank will give you a stack of documents to fill out and mail out, so that you can open an account and trade stocks. Free mailing.