I paid for a subscription for a month, but the applications go for a trial period of 7 days.

See here, too:

https://helpx.adobe.com/manage-account/kb/stop-creative-cloud-trial-mode-after-purchase.html

check your account to verify your subscription is what you expect and to verify your adobe id, https://accounts.adobe.com

if that looks correct, sign out and then back in to your cc desktop application using the same adobe id used to verify your subscription: http://helpx.adobe.com/creative-cloud/kb/sign-in-out-creative-cloud-desktop-app.html

if you didn't use the desktop application (from here https://creativecloud.adobe.com/apps/all/desktop?action=install&source=apps&productId=creative-cloud and use it to install your adobe subscription and trial programs), in photoshop click help>sign in, or if that's not clickable, sign out and then sign in (with the same adobe id).