After you login to storage navigator, change the mode to edit then use the Go menu and select Universal Volume Manager-> Volume Operation
Select Add volume (auto) -> Default policy
Click Port Discovery
Select the ports where you zoned the external storage (you can use ctrl or shift to select all the ports at once)
Now you will see the Array with the serial number. Click on it then click on the first port, the click on the WWn then right click the WWN and select Add. Repeat for the second port. When done click Ok.
Expand your s/n array and check the volumes that you presented to the uspv. Create a table with the ExG, LDEV and Characteristic, you will need it if you need to map the volumes to a host.
Click Apply then Ok.