To unlock the background image, first click on the picture or image and then select MODE option. After that, select the option GRAY SCALE and revert to LAYER. When you double click on the surface, the surface will be unlocked.
Healing tool is used in Photoshop to hide the unwanted spots or pictures that appeared in your original picture and makes picture look like real without any changes. The tool use complicated algorithm to calculate what would be the area of your picture based on the surrounding pixels.
In order to give an HDR effect to photo in light room, You have to open the develop module of Lightroom First step is to choose tone base The tone base will hightlight various settings like shadows, whites and blacks, constrast, clarity, saturation etc. It will set the foundation for the faux HDR effect