First check to see your plan is active: Adobe ID
Try launching Photoshop choosing Trial instead of a purchase.
Mac /Applications/Photoshop CC/Photoshop CC.app
Windows C:\Program files\Adobe\Adobe Photoshop CC\Photoshop CC.exe
Then once inside, go to Help > Sign in... There, use the email address and password for your account and it should activate.
If that does not work, could you tell me what version of PS you have and what os version you are using?
Adding to what Gene said, when I first purchased the Creative Cloud Photography Plan, it was understood that the Creative Cloud for desktop application would act as the "one stop shop" for everything relating to Creative Cloud. (Installation of programs, sync, libraries, etc.)
You should install that first, sign in with your Adobe ID, and be ready to rock by installing Photoshop from within CC for desktop.
Thanks! I forgot about the CC Desktop link. Into my notes that goes!
Same here, I did not know about that link. I have a one note page I am keeping links on now, makes it quite easy to copy/paste when needed.
Agreed. Saves from rooting around for that link that someone posted but you can't exactly remember where.