To manage these settings, select your name and choose Settings
This section is collapsable. To expand or collapse it, click the blue arrow in front of Expense Categories
You can add, edit or delete your categories which will allow you to categorize all of your expenses any way you choose.
To add a new category, click Add Category in the upper right corner of the Expense Categories section.
Enter the name of the category and click Add Category to save it or Cancel to go back
If you need to delete an expense, click the Trash Can icon next to it.
You will be asked to confirm this change. To proceed, click Yes, Delete. To cancel, click No, Go Back
You can also edit a category name by typing directly in the field.
More information about the Expenses page can be found here.