Renaming blog categories is easy and can be done with just a few clicks!
From your home feed, click on your site name and select Admin from the dropdown menu.
Go to the Blog tab in the sidebar menu and then select Categories.
Click on "..." next to the category you want to rename and select "Rename category".
Enter the new name for your category and save your changes.
Your category name must be unique and cannot be already in use by other blog category.
And that's it! If you want, you can also consider updating your blog category page settings.