Blog categories are managed as part of the Posts menu.
To add a category, click on Posts ----> Categories
Complete the fields provided to add a category and click Add New Category.
To edit a category, hover your mouse over the category and click edit or quick edit. You may also simply click on the category name to the right and make edits to the fields provided. Click Update.
To delete one category, hover over the category and click delete from the menu that appears.
To delete multiple categories, locate the categories you wish to delete and check the box next to each category you wish to delete. Next click on the drop down menu Bulk Actions and select delete. Click the Apply button.