Step 1: Selecting the Area/Image to Change
First select where you are trying to change the image.
Step 2: Accessing the Image Uploader
Once you have selected the area/item you wish to change, click on top of the image to populate the Image Uploader.
Step 3: Changing the Image
Once inside the image uploader, select the Red Trash Can Icon 
within the image.
Once deleted, you may now select Upload Image to upload the new image. Once done, select Add Image to lock in the change.