To configure a new-added or existed element you should use Properties pane.
Select an element on the Components pane or on the workspace and its available properties will be presented in the Properties pane. Once visible in the Properties pane, these values can be edited.
You can select a property by clicking on the property title or value. When a property is selected, an editor is displayed instead of the value, so the value can be changed. In most property editors Enter should be used to apply the value, and Esc to return to the previous value.
To set data source for a component operated on data you should use the Sources tab of the Components pane. The tab also provides editors allowing you to configure data sources.
For information of accessible properties, please refer to the related component documentation.