How can I integrate CAPTCHA on my register page to prevet bots to register (to prevent them from submiting the form).
You may search install a pluggin like No CAPTCHA.
Supports: Contact Form 7, Ninja Forms, Gravity Forms, MailChimp, Formidable forms, WooCommerce, JetPack comments and contact form, BuddyPress, bbPress, Fast Secure Contact form, S2Member, MailPoet, any WordPress registrations & contact forms and themes.