Create a Card Category:

Step 1: Go to settingsand then card categories

Step 2: Here you can add (by pressing +) then choose what type of card it is (card, location or person), name it, choose a colour and link fields. Hit "Add and Close" when you are finished.

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Edit an existing Card Category:

Step 1: Go to settingsand then card categories

Step 2: Choose a category from the dropdown menu. Rename it by typing directly into the underlined title. Press "Save" in the bottom right corner when you are finished, or alternatively hit "Delete" to delete the category.

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