Add charts to your workspace by clicking on the Charts 
menu.
Add a chart to your workspace by clicking on it. Double click on the chart that you added to open the charts menu.
There are several ways to add data to your chart. The first method is to paste the link from a public Google Drive spreadsheet into the space at the bottom of the menu. The other way is to manually type it into the table.
Change a category's color by clicking on the drop to the left of the category.
In the settings menu you can show and revise the title for your chart...
...make changes to the legend...
...revise your labels...
...and other finishing touches (which may change for each chart type).