You can use the Splunk Dashboard Editor to create your new dashboards, add/remove panels from dashboards, edit existing dashboards, and generate PDFs for a dashboard. The Dashboard Editor is really a series of dialogs that you fill out to accomplish what you want. Once you have created a dashboard, you focus on its panels and visualizations (using the appropriate editor).
Once you enable your Splunk dashboard to edit it, you can access a series of panel dialogs. Using the Panel Editor, you can modify the panel's properties and the underlying search. In addition, you have the ability to choose a different visualization and to configure it to fit your needs.