The first row of the data panel is the header: from the second column on, it holds the name of each series. The rows below hold the content, with the category name in the first column and one value per series beside it. You can paste the whole table straight from a spreadsheet.
In the design panel, pick a part to change its color, padding, corner radius, and font. The color of each series sits under Series, one series at a time. Drag the chart to move it and use the wheel to zoom. Drag a panel by its header, and double-click its title to switch how panels are laid out.