Taleo is OU's requisition and candidate management system. It is a browser-based application, meaning you can access it like any website.
First, make sure that you have access to Taleo and have completed any necessary training. Once you're sure your account is set up, go to ou.taleo.net.
The first time you log in, you will need to select an "organization." This is the database from which Taleo will draw your account. Use "fed.ou.edu", which appears by default.
Once that is set, you will be able to log in with your NetworkID (for Norman staff, your OUNet ID), just like you would any other university system.