Background Jobs

Hi ABAP folks ,

Please let me know how to run a scheduled background job immediately ?

If I go to transaction SM36 and give the job name it tries to create a new one ...

How to view the existing job and start execute immediately ?

For ex it is schduled to run by tomorrow ,I wan the same to run immedaiately

How it is possible?

Thanks in advance.

Rgds,

Jaga