Most functionalities you need to design a report can be easily accessed from the ribbon. From the ribbon, you can easily insert bands into the design surface. To learn more about report bands, see Report Bands Overview.
Once the report band is inserted into the design surface, you will notice that a visual adorner is attached to the left side of the band. To gain access to the report band, you need to click on the adorner. The adorner allow you to re-positioning the band by using drag-drop. Besides that, you will also find a resize grip at the bottom side of the visual adorner. You can customize the band's behaviour easily through the property grid, or using a smart-tag attached into each band. See the following screenshot.