To start calling for OB Express Job is no different from any other Outbounders Campaign. Go to My Campaigns >> Campaign >> Actions to the choice of your campaign you are interested in as seen on the reference below:

You’ll be navigated to the dialer page similar to other Outbounders Campaign that has the dialer activated. You can refer to the links below on how to set up your dialer, dialer requirements and how to use the dialer:

http://support.outbounders.com/kb/article/21-how-to-login-to-ob-phone