Decktopus offers 4 chart types, each with similar basics. Pick the one that suits your presentation best.
Bar Chart, Donut Chart, Line Chart, Pie Chart
Choose your chart type from the Elements section.
You can also find Position and other Settings here. Then click on the chart and Edit Data.
You can change the chart by right-clicking on it. Add or remove rows and columns as you need. To adjust the data, click on the columns.