Blocked just adding code to site

May I ask what kind of error do you get?
Can you post a screenshot?

Kindly, see below article to find more helpful information why it occurs:

Furthermore, I assume this warning/error message does not come from Cloudflare, rather from your Web browser due to the security settings (especially if using Flexible SSL option at Cloudflare dashboard under the SSL/TLS tab for your domain name) and possibly misconfigured HTTPS connection to your Website / origin host - server (due to the SSL certificate or serving traffic via secure HTTPS connection from your Web server).

Here is a way to re-check if you correctly setup the SSL for your domain with Cloudflare:

If any other issues appear, follow the needed steps for troubleshooting from article below:

Regarding available SSL options at Cloudflare dashboard, check here:

In case you do not have an SSL certificate, you can use Cloudflare SSL, if so, kindly make sure you follow the instructions as follows on the below article to setup an SSL certificate using Cloudflare CA Origin Certificate:

Last but not least, kindly have a look here for more information regarding correct SSL settings:

Otherwise, it could be due to some anti-virus program filtering your HTTP(S) (Web) traffic, if you are running some?

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