From page 17 of the QuickStart Guide for Client Management:
Create a Policy to Run Software Update
After you add a Software Update Server, create a policy to run Software Update on client computers. Creating a policy to run Software Update requires access to the JSS in a web browser.
To create a policy to run Software Update:
1. Open the JSS in a web browser.
2. Log in using the account that you created when you set up the JSS.
3. Click the Management tab.
4. Click the Policies link.
5. Click the Create Policy button.
6. Select the Create policy manually option, and then click Continue.
7. Enter a display name for the policy.
8. Assign the policy to a category by choosing an option from the Category pop-up menu.
9. Choose a trigger from the Triggered By pop-up menu.
10. Specify how often you want computers to run the policy by choosing an option from the Execution Frequency pop-up menu.
11. Click the Scope tab and assign computers to the scope.
12. Click the Packages tab and select the Install All Software Updates checkbox.
13. Click Save.
Computers run the policy the next time they check in with the JSS and meet all of the criteria on the General and Scope panes.
The default check-in frequency for computers is every 15 minutes.
