—Step1–Create the Login and user account in the Master database as follow–
CREATE LOGIN TEST01 WITH PASSWORD=’cfdfv@123_^92648451′
CREATE USER TEST01 FROM LOGIN TEST01
–step2–create user for the respective login in the user database—
CREATE USER TEST01 FROM LOGIN TEST01
–Step3–add the user to required role for eg:datareader–
EXEC sp_addrolemember ‘db_datareader’, ‘TEST01’;
If the users required to create the new tables in the database so you need to create the customized role as follow.
Example:
CREATE ROLE ModifyTable;
GRANT CREATE TABLE TO ModifyTable;
GRANT ALTER ON SCHEMA::dbo TO ModifyTable;
EXEC sp_addrolemember ‘ModifyTable’, ‘yourlogin’;

Adding Users to Your SQL Azure Database