Hello...
What you need to do is save this picture to a portable 'drive', often called 'flash drives' or 'thumb drives'. They are small devices that plug into your computer via a USB connection. You can then take the image to a place like Staples, Office Max and ask them to print the picture for you. The image's resolution will dictate how large and crisp the hard copy will be. They can tell you that at the store.
There are other ways to accomplish this task, but I don't know how computer savvy you are.
You can also upload the image to a website, and then go to a store and have them navigate to the image and have them get it from there, or you can buy software, install it and just do it yourself. That requires a bit of computer skill however.