How to use photoshop to change the logo color in gray version (tutorial)

Below just one sample and easy to use.
1. open your photo
2. open your logo png file
3. pull your logo png file on the photo and edit the size
4. CLICK- image -> adjustments -> Hue/Saturation

5. change the saturation to -100
6. adjust the lightness to " 70 to 80 " (depends on what you like)

7. edit the opacity to "80 to 100" (depends on what you like)

8. after edit, save your file. DONE!