Select the background
Copy the Studio Backgrounds folder to your computer, then pick the one you want to use. (Don’t worry if you’re not sure: you can change it later.) Right-click on it and select Open with > Photoshop CC, and it will load into the Photoshop interface. Now open your portrait (or use Zara.jpg from the disc for practice); press Ctrl/Cmd+A to select it, Ctrl/Cmd+C to copy it, and Ctrl/Cmd+W to close it. Back on the Studio Background image, hit Ctrl/Cmd+V to paste in your pic. Now press Ctrl/ Cmd+T; while holding Shift, drag the corner handles to size it how you want in the frame. Press Return when you’re done.