If you are a visiting the site
If you are a visiting a website with a security error there is not much you can do, the only thing you could do is whitelisting the domain name
If you are the owner of the site
If you are the owner of the site there are several methods to repair a security error.
report the domain as safe;
purchase an SSL-certificate;
check if you have an SSL-certificate (or check the expiration date);
Note: If you have purchased a premium or a business plan your SSL-certificate is included with the website.
If there are any further problems with the security of your website, or if you have security concerns you can contact us at firstname.lastname@example.org