That trendy color tinted effect explained here. In 3 easy steps!
Start with your image
in RGB mode
Open the Hue/Saturation
box Ctrl/Cmd+U
Click the colorize box.
Slide the hue slider
to change the color hue. That simple!
You can adjust the Saturation if you want. To the left, less color, to the right more. Too easy!
The result!