Once the rendering is complete you have the option to save the image by simply using the "SAVE AS" command under the File menu. The created image will not reflect future changes to the model and new images will need to be created as needed to reflect the current state of the model.
Alternately, you can create a saved view by dragging the Camera (Generic Perspective) from the project map to the view map. Once you've created the view you can specify if the image should be created in the photorendering window or just the regular 3d window by opening the newly created view's settings. Last, add the view to a layout just as if it were any other plan or drawing. This method will regenerate the image as the model changes.