Grant Administrative Rights on SQL server 2012

Feb 8 2015 9:01 AM

Hi I have faced this error in my sql server 2012 :
System.Data.SqlClient.SqlException: CREATE DATABASE permission denied in database 'master'.
I think this is due to I don't have permission to create databse in 'master' so I think to grant my administrative rights on sql server 2012, please how we can grante administrative rights on sql server management studio 2012.