This time I want to share with all of you one very nice tool from CodePlex - Microsoft's open source community.
This desktop application will help you manage your Logins and Users on Azure SQL DB.
Actually it does nothing but convert your GUI clicks to T-SQL commands that reflects you commands.
Go and visit the product page for more details.
If you want to read more about manage SQL Logins and Users in Azure SQL DB: https://azure.microsoft.com/en-us/documentation/articles/sql-database-manage-logins/