To export your chart from an Apple device, tap on the 'export' button in the bottom right corner of your chart. A pop up will appear giving you the option to "Export Chart as PDF" or "Export Chart as Picture." By exporting your chart as a PDF you then have the option to email or print your chart. By exporting your chart as a picture you have the option to email it or save it to your camera roll.
Tap the Export button in the bottom right hand corner of the chart to export your chart.