Individual questions/variables can be selected via the navigation bar on the left. You can either click on the respective question in the navigation bar or drag it to the right onto the workspace. You can also click on several questions one after the other or drag them onto the dashboard using drag&drop and thus create individual dashboards for yourself.
Once you have created the charts, you can edit them with various functions. For example, you can change the chart type via the cogwheel symbol or enlarge the chart via the magnifying glass symbol.
You can find numerous functions on the editing bar: