Edit 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...
Video
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 Edit Category click it.

When you see the Name & About field. You can fill it in then press Save.

You have now edited a category.