Firstly, if this is your domain and if you want to do it by using Cloudflare services, the domain
safeness.es should have to be added to your Cloudflare account, therefore it needs to have the Cloudflare nameservers which were given in the process of adding it.
Furthermore, you could achieve this by navigating to and using Cloudflare Page Rules - Forwarding URL and following instructions written on the below tutorial:
Screenshot of an example:
Make sure your domain is proxied to make it work
More about it here: