Hi @funglai. Thanks for being part of GoDaddy Community! It's not clear what you need help with. If you need to update your domain's MX records, check here. If you need to add new MX records, check here. If you're not sure which MX Records to use, that will depend on the mail service you're using. If you can share that, someone may be able to suggest additional steps.
JesseW - GoDaddy | Community Manager | 24/7 support available at x.co/247support | Remember to choose a solution and give kudos.