Enable Broker for a database attached in the website App_Data folder

My apologies,
When I open my project. My Local Database (.mdf) successfully connects to the SQL Server. (In the server explorer shows as follows
-------------------------------------

Data Connections
MyDB.mdf
Database Diagrams
Tables
Views
Stored procedures
Functions
etc
My-PC\sqlexpress.aspnetdb.dbo
My-PC\sqlexpress.dbEmployee.dbo
Servers
My-PC
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Now, To Run Query { Alter Database myDB Set Enable_Broker },
I go to the T-SQL Editor under Data menu and open a NEW QUERY Connection.
In the Editor, I type the same query as it is. And It gives me error as follows:
--------------------------
Msg 5011, Level 14, State 5, Line 1
User does not have permission to alter database 'dbbooks', the database does not exist, or the database is not in a state that allows access checks.
Msg 5069, Level 16, State 1, Line 1
ALTER DATABASE statement failed.
---------------------------

Also,
I tried,
To attach my local db .mdf file using Management Studio but gives the following error:

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TITLE: Microsoft SQL Server Management Studio
------------------------------
Failed to retrieve data for this request. (Microsoft.SqlServer.Management.Sdk.Sfc)
For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&LinkId=20476
------------------------------
ADDITIONAL INFORMATION:
An exception occurred while executing a Transact-SQL statement or batch. (Microsoft.SqlServer.ConnectionInfo)
------------------------------
CREATE FILE encountered operating system error 32(failed to retrieve text for this error. Reason: 15100) while attempting to open or create the physical file 'G:\ABC\BookShopping\App_Data\MyDB.mdf'. (Microsoft SQL Server, Error: 5123)
For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=10.50.1600&EvtSrc=MSSQLServer&EvtID=5123&LinkId=20476
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I want to execute the Enable Broker query for my local database .mdf file.
Thanks,
Jass