Cloudflare will scan your domain's existing DNS records and ask you if you want to copy them over to Cloudflare or make any changes.
Step 4. Click the Next button.
Step 5. Select the Cloudflare plan you want to use. The free plan is at the bottom.
Step 6. Click the Confirm button.
Step 7. Update the name servers for your domain to the ones provides by Cloudflare.
Once your domain name servers are propagated across the internet your DNS records will now be managed by Cloudflare.