1. First of all you need the "WiFi Info Docklet" by fedroponce: https://www.wincustomize.com/explore/objectdock/14429/

2. Put the icons folder in "C:\Program Files (x86)\Stardock\ObjectDockPlus2\Docklets\WiFi".

3. Right click the dock and select Add -> Docklets -> WiFi Info.

4. Right click on the WiFi docklet -> WiFi Docklet Settings -> and select "WiFi icons by sharp-design" for the Image Set. You can also disable all "Docklet Info"s.