A meta description is a summary of the content of your web page. Search engines use it to display a “snippet” of your page in the search results. For example, this is what Google will show if you search for “MRKWP.”
1. Open your post in the WordPress editor. Scroll down to find the Yoast panel.
2. Navigate to the “Meta box” above Yoast SEO analysis. You will see an empty field to insert your post’s description.
3. Ensure that it is optimised for SEO. Also, focus on Yoast’s character limit of the meta tag. If you exceed the allowed number of characters, it will warn you by changing to the color orange. Update to apply the changes.
Take a look at these other links for more information.