To manage categories that are created in NorrCompetition you can use an item in the the sidebar navigation or through the icon on the Control Panel as you can see from the screen shot below:
Also you can use the menu Components > NorrCompetition > Categories.
You will see the list of already created categories:
On the list above the table columns are divided to:
On the top there is a filter for the quick search by category title.
You can perform the following actions by utilizing the toolbar at the top:
If a category contains at least one contest, it cannot be deleted. If you want to delete such category then you should unset the corresponding contests first. Otherwise you will get an error.
To change the order of categories on the front-end of the website you should click on the ordering column. It will become active. Then you should click on the action icon and holding a mouse button move an element to the top or to the bottom (drag and drop). The order will be changed.