I remembered ............... I practically opened the catalogue of materials and gave in the rendering/text the image I wanted, then I applied the image to the surface or to the body................ , I don't know what and how you need it, try it, and let us know if it's okay with you............
I explained badly... I practically created a new material (or mod an existing one) and I put under rendering/text the image I wanted , and I applied the material to what I wanted . Obviously it is only x the 3d you could not print the image