1) Load the project into Intel XDK
2) Add a third party plugin manually: cordova-plugin-ad-admob
3) Build the application
4) Download the zip file
5) Extract the zip file
6) Copy the one that says armv7 to your android device via a USB cable
7) Find that file on your android device using a file manager
8) Tap on that file
9) Go through the prompts to allow installing from unknown sources
10) Click on install
11) Goto the apps area and click on your app
12) Proceed to test the ad functionality of your application
Fun Facts:
NO, there is no other way to test ads. You must redo this process EACH and EVERY time you want to try new code for ads (That I am aware of*)
IF, you don't have test mode on and start viewing your own ads, you'll lose your account because you are commiting fraud
YES, it sucks having to do this process. Welcome to the world of programming and app development. Doing the same thing over and over and over again