To add a TXT record, go to My Domains > DNS Records and click on the “Add А New Record” button, then select the desired domain from the “Hostname” drop-down menu. If the record will be added for a domain, leave the field before the drop-down menu empty. If it is for a subdomain, type in the subdomain name.

Example: to add a TXT record for my-best-domain.com – just select it from the “Hostnames” menu.
To add a TXT record for webmail.my-best-domain.com – type “webmail” and select “my-best-domain.com” from the menu.
Select “TXT” type of the record from the ‘Type’ menu, then type its value in the ‘Value’ field below.

Example: for TXT the value should look like: v=spf1 mx -all

Optionally you can adjust the TTL settings. Click on the “Add a New Record” button to add your new TXT record.