in addition to Dennis' worthwhile hint I want to give a link to Adobe's "first step manual", so you have your "cookbook" always ready. Please see here:
On the other hand. start your PhotoShop the first time >>> (translated from my German PS) >>> Open File >>> go to your Directory, where your images in question are stored >>> click on it >>> and now your image is on the screen ready for editing and now enjoy exploring PS CC.
Oh I forgot, in my WIN I can click into an Image, say "open with" and by using PS, it opens of itself.