Add wording or graphic elements to your picture using a photo editing program on your computer.
Select a print shop or find an online service. If your picture is not electronic, you will need to put it into an electronic format to send to an online printer. However, if you go with a local printer, you may be able to simply take them the original picture. To print it, they will put it into a format used by their computers and printers. You should get the original back when you pick up the vinyl poster.
Verify the design of the poster with the printer or online merchant with a proof. This step ensures that the finished product will look the way you want it to. Proofs are generally smaller versions of the finished product. Once the proof is approved, your picture is then printed.