Cannot build custom developer app

I have followed the instructions here:

Custom Build | PhoneGap Docs

but when I try and add then build the project in the command line, I get the following error in the terminal:

$ cordova platform add ios

-bash: cordova: command not found

$ cordova build

-bash: cordova: command not found

This is after a successful node install. Full terminal output of the entire process (after cloning git):

I didn't get any errors, but after changing my widget id name in the next step and trying to build the project I receive the command not found error.