The Easy Bib add-on can be found here.
After you install Easy Bib, you will need to give it permission to run.
To use Easy Bib, you'll need open a Google Doc and then go to Add-Ons.
Select Manage Bibliography.
A "Cite A Source" dialogue box will open on the right of your screen.
Choose website or journal - which ever is appropriate for your source.
Then choose Chicago Style and paste the URL of your website/journal article.
Easy Bib will then generate a reference - select the reference.
You can then add to your Google Doc.
AS ALWAYS, CHECK TO MAKE SURE THAT THIS PROGRAM IS GIVING YOU ALL THE CORRECT INFORMATION.