You can Sign Up by simply follow the below method.
First, visit the All 4 website and play any video.
The screen will appear prompting login or Create a new account.
Log in with your account credentials if you have already one or create a new account by entering your email, password, and postcode.
After verification of your email address, you will be able to log in.
Finally, after logging in you’ll be able to stream whatever you like.