So firstly, what is it you’re trying to do? Are you trying to add your domain to a DNS service, or something else?
Second, what is the domain name you’re trying to do this with?
Using the dig command, it looks like that domain is currently using an A record to point to the IP of one of InfinityFree’s servers. But again, what exactly are you trying to do?
Are you trying to migrate the entire website of gdfemia.com.ar to a different provider? Please note that our DNS hosting is only intended to be used along with our web hosting, and it offers quite limited options. So if you don’t plan to use our hosting with that domain, you should probably use different DNS hosting. Most domain name providers also provide free DNS hosting with the domains they sell, and your new website host many also provide DNS hosting.
This was changed recently. It used to be that the SPF records section accepted most other TXT records too, but it was changed recently so it only affects SPF records.