You can open a ticket by going to support.cloudflare.com, logging in.
Then at the bottom of the page there’s a search field.
You can search for information relative to your issue, many problems have ready solution.
If search does not yield a satisfactory response, you can click on Submit a Request.
On the next page, click on Get More Help. This will open the request form.
After you submit it, expect an automated message acknowledging your request, followed later by another automated response with suggested answers.
If the answer does not work for you, reply to that message and wait until a support agent gives you a direct response.
You can also provide more information about what’s wrong with your site, any error messages, or screenshots of your Cloudflare configuration (obscuring the origin IP address), so that someone from this community can help you with suggestions.