To sign in with Read&Write for iPad with a Read&Write subscription, open the Read&Write app on your iPad.
Tap Sign in or Enter Serial or Product Code button to link your account.
You can then enter your product code or sign in with either Google or Microsoft.
That will link the account to allow the premium features.
If you've done this and are still not seeing the premium features, please click below for further instructions.
I get the message 'Please enable full access to use this feature'