The tracking code is unique to your account and can be found in the integration tab on your dashboard.
You will need to finish the first two steps (Google Ads permissions and tracking template installation) in order to see the third step; The HTML Tracking Code installation.
Installing the tracking code is easy and you can find more information here:
Where should i install the tracking code in my Wordpress back-end?
Where do I place the HTML tracking code
Which pages should contain the HTML tracking code?