I'm using netlify by building directly from github. How would I go about inserting cloudflare into this?

I think you can sign up for a Cloudflare account and add the JS snippet they mention to your site. It’ll look like

<script defer src='https://static.cloudflareinsights.com/beacon.min.js' data-cf-beacon='{"token": "$SITE_TOKEN"}'></script>

Ahhh okay thanks thought it had to be done by using cf as a cdn or something.

Totally understandable that you would think that. Cloudflare also provides server analytics if you use them as a CDN. That doesn't work for single page apps which don't necessarily make server requests when the URL changes, so they introduced a new product ("Web Analytics") to handle this.