Adjust Hue/Saturation to a Swatch Color?

[mellissat2727]

I'm working on a fairly simple project where I take a photo of a building and change the color of the walls to give an idea of what it would look like if it was painted a specific color. I've been able to adjust colors with the Hue/Saturation Adjustment in the past, but what if I want to change it to be a specific color? I have a few specific real-life paint colors that I have saved as swatches, I noticed there is an eyedropper tool icon within the Hue/Saturation dialog window, but it has a No (circle backslash) symbol when I try to click it. 

Is there a way to adjust Hue/Satutaion to a color I have saved as a swatch?

If not, is there another way I can go about this? The walls in the photo have texture, otherwise I would just outline the wall and make a quick shape with the fill set to my swatch color. 

[dianer_macperson]

There are many ways to do this but here's the easy way:

LAYER>NEW FILL LAYER. (pick the color you want). Change mode to "color"

On the layer palette, make sure fill layer is set to "color" mode (or multiply) 

then adjust the mask transparancy or color as needed.