Hello, Darul Muqarrabin Malaysia,
We have created a contact form using the Contact Form 7 plugin, which can be edited under WP-Dashboard >> Contact according to your needs.
For more information, please refer to the official documentation of the plugin at https://contactform7.com/faq/how-can-i-add-a-field-to-my-contact-form/.
Best Regards,
8Theme’s Team.