Without knowing the printer type is hard to tell how to use the driver for your printer. The documentation of your printer will tell you how to do it. Maybe a search on this form with your printer type can help you or a search on Google.
If it is a 'standard' chinese type ESC/POS Bluetooth thermal printer this might help. The demo includes printing an image although the results can hardly be described as good on a thermal printer!
For the last couple of weeks I have been playing with an 80mm Bluetooth ESC/POS thermal printer I bought off eBay, new and delivered, for the ludicrously cheap price of £20. While the print quality, particularly of images with large areas of black (they are gray due to power supply or thermal...