I had to do this prior to creating a maintainence plan for a database on my Production box.
When I first tried to create the plan I was given a message that "Agent XPs" are not enabled and that I should run sp_reconfigure.
Run this statement then you can do get on with it:
SQL Query: sp_configure 'show advanced options', 1; GO RECONFIGURE; GO sp_configure 'Agent XPs', 1; GO RECONFIGURE GO