Select a layer from the dropdown menu from which you want to identify features (available layers are those visible and are potentially selectable. You can select any of these layers). Next enter a distance and units and click OK. In the example below we want to identify all features from the layer "Renosterveld River Corridors" within 5 km of the point of selection (near Wellington).
The results will be displayed in the information window, and a circle will mark the defined area on the map.