Browse to the virtual system's profile in your Satellite's web interface by logging in and navigating to Systems ⇒ Systems ⇒ Virtual Systems and clicking on the name of your virtual system's profile.

In the virtual system's profile, click on the Software ⇒ Packages tab.

Click on Install New Packages in the Packages tab menu.

Select the packages you wish to install and click the Install Selected Packages button in the lower right-hand corner of the screen.

Review the package install details and click on the Confirm button in the lower right-hand corner of the screen.

The package install will take place the next time the guest system checks in with the Satellite. To force the install to take place immediately, you may run the rhn_check command on the guest system.