 Mapping in QGIS. Adding data. To add data to your map, click on the layer tab and select Data Source Manager. You can also access this function by clicking the Open Data Source Manager icon in the toolbar. On the left, you will see all the options for the different data formats you can add. Select the tab of your corresponding data format. Under Source, select the browse icon and locate your file. Select Open, Add, click on Close. Your data has now been added. For more information on QGIS, visit the UTM Library QGIS playlist.