Cancel or Remove a backup to a database in SQL 2008 R2

Need to delete or disable a configured database backup job on SQL Server 2008 R2. 

Configured it in two places, one through the Maintenance Plan and the other one was done by right-clicking the " database" -->selecting Tasks-->Back up and Set a Schedule to run every 2 hours. I need this one canceled or removed and it won't allow me, I went back in and set the schedule to backup for only one day and it still did not stop.

Any Ideas, just want to keep the one created in the Maintenance Plan?

Thanks