Creating a new category
Step 1: In order to add/delete a category go to Posts > Categories.
Step 2: To add a category, simply type its name in the Category Name field. If you wish, you can also type a category slug, description and choose a parent item. Then click Add Category and your new category will be created.
Deleting categories
Step 1: To delete an existing category, hover over it and then click the Delete button.
Step 2: You can’t delete the default Uncategorized category.
Step 3: If you delete a category that has posts filed in it those posts will be assigned to the Uncategorized category.