Try to log out and log in again and if that wont work delete the app and install it again.

Make sure you are logged in with the email you registered with.

If you don't remember which account was used for registration, use the email address that receives email alerts from Seeking Alpha. 

If you forgot your password you can always recover it, simply follow the “forgot password” flow.

Are you logged in with the same email account you registered with?

Did you try reinstalling the app?
Login with your email and all your data will be available to you.

What functions do you mean?

Taping the percentage will toggle the view. 

Thank you for your feedback.

The pre-market info is not gone. All you need to do is tap to toggle the price and the %.