I have Job Level approvals set up for P2P requisitions how do I change the amounts against them?

I have a set of job levels attached to employees that need to have the monetary amounts changed in Oracle Fusion, but I am struggling to find documentation on how to do this, can someone advise please? The documents I have found point towards Set up & Maint>Manage Jobs but I don't seem to be able to find them in there. I need to lower the monetary limits on the levels we currently have set up.