Is there a tutorial where you can change the color of like someone's shirt for instance. Like it could be red and then you can change it into pink.

for photoshop: go to layer > new fill adjustments > color balance. And mess around with it. When you're done, choose a brush and make sure the color is black, and brush everything except the shirt.

Have you tried selecting the shirt,adding a new layer, and filing that selection with a different color (in a seperate layer)? Then you can set that layer to "Overlay" or whatever looks best.