Here is how to edit the slug of a published article:

Step 1: Open the article link on your blog.

Step 2: Scroll down and locate the Edit button just after the article's title.

Step 3: Click on the "Dropdown" icon from the editor header for more options and select the "Article Settings" option.

Step 4: To edit the article's slug, navigate to the "Post slug" section in the sidebar and click the pencil icon.

Step 5: Click on the "Update" button to save your changes.