Rank Math has a long tutorial on how to edit meta titles and descriptions. Here: https://rankmath.com/kb/editing-seo-meta-at-scale/

It's very long and probably time consuming, so If you don't have a lot of time you can try our latest free WordPress plugin called Orbisius SEO Editor.

You just need to select Rank Math plugin from the Source SEO Plugin's dropdown and then decide what to bulk edit meta titles, descriptions or both

You can also export and import in CSV.

Do you use test/staging sites? Visit qSandbox for more info.

Disclaimer: The content in this post is for educational purposes only. Always remember to take a backup before doing any of the suggested steps just to be on the safe side.
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