You need to sign in to Read&Write to access the features. To sign in to Read&Write:-
1 Click the icon on the top of your Read&Write toolbar
2 Click on the Show more... button
3 Click the Sign in with Twitter button
4 Enter your Twitter login details and click on Sign in
5 Click on the Authorise app button to accept the permissions.
When you see this message, Read&Write is ready to be used.