Click on the Finder icon
Select the Connect to Server... item in the Go menu. You can use ⌘K shortcut as well.
Type http:// and Scanner Pro server's IP address and port. For your iPhone it is http://127.0.0.1.This information is displayed on top of the Online tab on your iPhone.
Press Connect button. You can also add a server to Favorite Servers list.
As a result you should get Shared Disk mounted on your Mac. You can enable Connected servers setting at Finder Preferences → General to show it on the Desktop.
Attention: sometimes your device may change IP address inside WiFi network. In this case you need to reconnect to the WiFi Drive again using the new IP address.