The next slider is "Saturation," which will either add more of the hue to the selection or take it out. This is where experimentation begins and the preview function is helpful, so you can see your changes as they are made. Click on the layer with the tree and use the Magic Wand Tool to select the tree silhouette. A white layer mask thumbnail will appear on the selected layer, revealing everything on the selected layer. The next slider is "Hue" which will change the color of the selection/image you are changing to another shade or color. Select a layer in the Layers panel and click the ‘Add layer mask’ button at the bottom of the panel. Photoshop has a blue, square-shaped icon that says 'Ps' in the middle.
This wikiHow teaches you how to use the Magic Wand tool in Photoshop. It is used to select sections of an image that have a similar color or tone. One that comes to mind that used to work: use magic wand to select the background (and interior parts if you want them to go away), do whilst shift pressed to add more areas, hit ctrl+i to invert selection, and without deselecting (so it gets placed in same area) hit ctrl+v. If you want the whole area replaced, move it all the way to the right. The magic wand tool is a selection tool in Photoshop. There are several ways, like always, like in Adobe Photoshop or the like. The "Fuzziness" slider at the top will display how much of the selection is going to be replaced by your changes in the box right below it in white. After the color is selected in the "Replace Color" box, you can change the color. Sometimes, it will automatically select the color you're changing, but sometimes you will have to use the Eyedropper Tool and click a hue of the color you wish to change. After the Replace Color box is open, you may have to select the color that you want to change in the image. Go to Image > Adjustments > Replace Color. The next step is to open the replace color box. Use the "Magic Wand" tool to select the color you wish to change.