This tutorial will help you learn how to manage your categories in the WordPress program. You should begin by logging in to WordPress, and going to your Dashboard. In the left hand column you will find your menu items. Click to expand the Posts option. This will give you the options of Posts, Add New, Categories, and Post Tags. Click on Categories.
This takes you to a Categories screen. To Add a New Category, type the name as you would like it to appear on your site in the name box. Below that box, is a box to type in the "slug", which is the URL-friendly version of the name. Scroll down, and if you wish you can choose to select a category parent. Enter a brief description in the box. When you are ready, click on the Add New Category button.
On the Categories Page, you can quickly edit a category's information. Select the category you wish to edit, and in the right hand column click on the quick edit link below the appropriate category. Make any changes, or click cancel. Delete a category by clicking on the delete link in the same area. You will be asked to confirm that you wish to delete the category. Click OK to confirm.
This is the end of this tutorial. You now know how to manage categories in WordPress.