Configure SQL Agent Operator role

http://msdn.microsoft.com/en-us/library/ms187901.aspx

Using SQL Server Management Studio

To add a SQL login or msdb role to a SQL Server Agent fixed database role

1. In Object Explorer, expand a server.
2. Expand Security, and then expand Logins.
3. Right-click the login you wish to add to a SQL Server Agent fixed database role, and select Properties.
4. On the User Mapping page of the Login Properties dialog box, select the row containing msdb.
5. Under Database role membership for: msdb, check the appropriate SQL Server Agent fixed database role.

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To configure a proxy account to create and manage SQL Server Agent job steps

1. In Object Explorer, expand a server.
2. Expand SQL Server Agent.
3. Right-click Proxies and select New Proxy.
4. On the General page of the New Proxy Account dialog, specify the proxy name, credential name, and description for the new proxy. Note that you must create a credential first before creating a SQL Server Agent proxy. For more information about creating a credential, see Create a Credential and CREATE CREDENTIAL (Transact-SQL).
5. Check the appropriate subsystems for this proxy.
6. On the Principals page, add or remove logins or roles to grant or remove access to the proxy account.