Hi and welcome to the forum! Please note that this is an English-speaking 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:
For the first option you might be able to add the MX and SPF records under the “MX Records” and the “SPF Records” section of the Control Panel, but the problem is that the record for the mail subdomain is an A record and so can’t be added, unless you do a reverse DNS lookup for the IP and add a CNAME record under its respective section with name mail and as destination the hostname the reverse DNS lookup returned.
For the second option (which is the simplest one in my opinion because you don’t have to do stunts just to add some records, but still requires to change DNS records) you can revert back to your domain registrar’s nameservers and then add two A records, one with as name your domain (or @) and another one with name www, that point to the website IP shown on the hosting account’s dashboard in the Client Area. Like so your website will still work and your emails will start to work as well.