Help with : How Can I know the schedule for a JOB, and How Can I Change?

Hi

I have a job and I know the name...I review in table TBTCO and I saw that this jobs is schedule at 11:00 AM and at 4:00 PM, but I need to change the schedule for this job..and that this job will execute al least four times during the day...I don´t know how can I change the schedule??

I was thinking that if I run the transaction directly I can run, Im not sure, because I try to do in QAS environment... I when I try to run the program..the system doesn´t do anything..this mean I cant execute with F8, such as if I should be complete a parameter, but all the fields are completed.

Thank you for your help, I promese that I will gice you points for your help.

Alice