To create a SPF record, log in to your customer account. Click on “Nameserver” on the left side of the customer area and afterwards on the modify button of the respective domain. Then follow the subsequent steps:
To add a SPF entry, leave the “Name” field at the end of the page blank.
Choose “TXT” from the drop-down menu.
Enter the SPF entry into the “Value” field. Infos about the syntax can be found here: http://www.openspf.org/SPF_Record_Syntax
Thereafter, the SPF entry is set up correctly and will be active within a few hours.