Hi and welcome to the forum! Please note that this is an English forum and so you must speak in English or at least provide an accurate translation of your content. Since you didn’t do that I’m gonna translate it for you:
You can’t install intermediate certificates on free hosting. You can either leave it be, or if you want a free solution, get a free custom domain from EU.org (if you withstand the wait) or PP.UA, change the nameservers to ours, add it on your hosting account under either the “Addon Domains” or the “Parked Domains” section of the Control Panel and configure Cloudflare on it with this guide: