Delete Category
About
Categories can be used on Expenses & Subscriptions. They help separate the data so you can see how much your expenses are for going out to eat ETC...
Tutorial
The first step to update a category is to go to the Categories on the Dashboard:

Now click on a category

You should see an Actions box with a button inside that says Delete Category click it.

Once you click the Delete Category you will be presented with a confirm box.

The category should be gone now.