1. On the Selected Charts screen tap the arrow to go to the chart selection options
2. Tap Select From File to go to your list of chart files

If you want to delete a whole chart file at once
a. Tap on the Edit option at the top right of the screen
b. Tap on the Delete option (the minus sign) on the left of chart file you want to delete
c. To give you a chance to change your mind, you will now be asked to Cancel, or Delete. If you tap Delete, all the charts in that file will be gone.

If you want to delete a single chart
a. Tap on the chart file that contains the chart you want to delete
b. Long Press on the chart you want to delete, and hold your finger there for a few seconds to highlight the chart
c. Tap on the trash symbol on the upper right of the screen. This will delete that chart immediately.