1) Click "Reports" from your Navigation bar

2) Select "Expenses" and then "Expenses by Category".

You'll see a report sorting all expenses in your account by category.

To create your own categories, follow these steps:

1) Open a new expense.

2) In the expense, scroll down and click on the "Category" field.
3) Click "Manage Categories".

4) Click "Add New Category".
5) Type in the name of your new expense category.
6) Click "Save.

Now you'll be able to use your new category when creating expenses, and run reports based on that custom made category here.