Sorry, running too fast. Here it is. Get Adobe Creative Cloud Desktop App & Adobe Application Manager
Also you don't have to upload a photo to Adobe CC in order to edit it. You can open a photo from your Desktop or any folder in your drive, but first things first.
Download and install the CC Desktop app. Sign in
From the Desktop app you can install Photoshop. It's 1 GB and will take a while depending on connection speed.
You got 30 free days to use the trail.