How do I add multiple keywords to WordPress?

To activate meta keyword, visit SEO > Titles & Metas. Then go to ‘other’ tab and enable meta tab option. Do not forget to save the changes. From now on whenever your edit/create any post and pages you will get the option to enter meta keywords.

For More Information Please Refer: https://www.mustbeweb.com/how-to-add-multiple-focus-keywords-in-yoast-seo-for-free/