Use the top navigation bar or scroll down from the map to access the charting area. Default charts display there, with icons to cycle through the chart types, while you can create a new chart with 'Generate New Chart' at the top of the screen.
Fullscreen Charting & Exporting
Click on the expanding icon on the top right of any of the charts to open the full screen charting type. Here you have significantly more control over the labelling and charting types, and in the bottom right you can click export to download the displayed chart.