How do I edit an existing set?

You can remove charts from a set by swiping the row for the chart and tapping "Remove". The chart will be removed from the set.

You can also add new charts to the set by tapping the plus (+) icon at the bottom left corner of your set's screen. You will be presented with a new window with a list of all the available charts. Select or deselect charts to your liking and simply press the "Done" button when you are satisfied.