如何在AZURE SQL SERVER中向dbo用户授予CREATE PROCEDURE权限

I have created the AZURE SQL SERVER, while creating taken "mike" user(as admin). when I logged in from Db-visualizer and trying to create "sys.sp_addlogin" stored procedure there I'm getting following Error : [Code: 262, SQL State: S00018] CREATE PROCEDURE permission denied in database 'master'.I have created the AZURE SQL SERVER, while crea