1. Set your design software to work in sRGB IEC61966-2.1 colour profile

Both MAC OS and Windows PC users:

Open your Adobe application (Photoshop). Open the “Color Settings” panel (usually it’s Command+shift+K in MAC OS and Ctrl+Shift+K in Windows)

In the “Working Spaces” box, choose sRGB IEC61966-2.1 as the RGB working space. Note: all your Adobe applications (e.g. Illustrator, InDesign) should have the same set up.
Select sRGB as a default RGB

Your “Color Management Policies” should be set as per the screenshot.
Photoshop colour settings

2. Set up your monitor screens to work in sRGB IEC61966-2.1 colour profile

MAC OS users:

Go to System Preferences and select “Displays”
System preferences, Mac OS

Then select “Color” and choose “sRGB IEC61966-2.1″.
System preferences Mac OS

That’s it, you’re done!

Windows PC users

Go to “Start” and find “Control Panel”
Start menu

Double-click on “Display” to open “Display Properties”.
Double-click on "Display" to open "Display Properties"

Select “Settings” tab and hit “Advanced” button.
Select Advaced

Select “Color Management” tab and make sure the “sRGB IEC61966-2.1″ is selected. Hit “OK” or “Apply”.
sRGB selected

Done!

NOTE: If you work on two monitors, make sure you set both of them to sRGB (Mac users will notice two preference panels, one for each monitor. Windows users should repeat steps from before hitting “Advanced” in Display Properties.