Add a TXT or SPF record to a domain:

Login to your account. (https://secure.webhero.com).
Select the menu option Domain.
Click on a DNS. (https://secure.webhero.com/domain/dns).
Change dropdown to TXT or SPF.
Add Domain Name.
Click to set the value.
Input the text in the "Value" box popup.
Click Done.
Click on "Add Record".



Notes:

The SPF Text String should be entered in the following format (for example):

v=spf1 MX ip4:216.57.227.0/24 ip4:216.57.225.0/24 -all

(The above SPF record, Specifies which IP addresses are allowed to send mail for mail.webhero.com.)
You can create the SPF record using an SPF wizard,https://www.spfwizard.net/.