You can manage your DNS records via DNS Zone Editor. To add a new record choose the type of record as TXT:
If your domain is pointing elsewhere by NS records, your DNS Zone management is moved to the provider you pointed the domain to and should be managed from there.
What to use as a Host?
If you are adding TXT records for your domain, insert @ as host.
If you are adding TXT records for your subdomain, insert the subdomain’s name as a host, for example for subdomain support.hostinger.com you should insert support as a host.
What to use as TXT value?
TXT value is for the value you want to be added to your domain. Usually, it’s for SPF records or verification records, like when adding your domain to Google Search Engine.
What to use as a TTL?
The default TTL value is recommended. By default, the TTL is set to 14400 seconds (four hours).
How to edit or delete TXT records?
If you want to edit an existing record, check this article: How to manage my DNS records on hPanel?
Any DNS Record changes trigger propagation, which can last up to 24 hours to fully propagate.