How to apply a colour correction on photoshop

First of all you have to go to your layers, and at the bottom you will find a button 4 buttons along saying "create new fill or adjustment ".

Press that button and choose solid colour, obviously pick the colour you want, choose overlay, and change the opacity to about 50%

Place the newly created layer above the layer that you want a colour correction to be applied to.

You should now have a colour correction on the image that you wanted.