Please post the image in question and provide a more detailed description of your intention.
1 person found this helpful
Are you asking how to select a single color to make the adjustment to it? Here's some info on using Select>Color range for that Select color ranges in Photoshop and on making selections in general Make selections in Adobe Photoshop.
You could duplicate your layer, then make the selection and apply a layer mask (click the Add Layer Mask icon at the bottom of the Layers panel while a selection is active) to it so that you can apply adjustments to just that layer. To make the adjustment layer only affect that layer, while the adjustment layer is selected in the Layers panel, move the cursor between it and the layer below. Alt-click to have it just apply to that layer.