You can enable Hire on the GO for your clients simply by turning on the Hire on the GO advertisement. It's easy to give access to all of your Clients at once by following these steps.
1. Go to Employer on Demand
2. Go to System > Advertisements
3. Uncheck the Inactive box
That will enable the Hire on the GO advertisement for all of your clients. When a client clicks on the Hire on the GO advertisement, it will create a new Hire on the GO account for your client, enabling your client to begin posting and advertising jobs online right away.