1. Open the image in Photoshop (File>Open):
    1.png
  2. Select File>Place and select your watermark:
    2
  3. The watermark will appear on the photo.
    At this point move it to the area you desire, increase or decrease the size:
    3
  4. Once you’re satisfied with the positioning and size, right-click anywhere on the photo/watermark and select [Place].
    4.png
  5. Voila! You’ve quickly added a watermark to your photo 🙂
    WMTutorial