Assuming you have some electronic photos of your new boat on your device (and know where they are located), click on the "Upload a File" button. The software will open a dialogue box giving you options, such as "select file". Navigate to your desired photo, select it and then click "close".
Then, you'll be asked to choose between "thumbnail" or "full size". Personally, I prefer thumbnails.
Try to keep them of reasonable size, pixel-wise, for the bandwidth-challenged among us?