SPF record for Mail

Ok, if I check out: http://www.dnsreport.com/tools/dnsreport.ch?domain=ffxionline.com

It gives me towards the end that i’m missing SPF record, On my previous server I did this by editing my DNS information.

I’m on a dedicated server by DreamHost. Should I go ahead and edit the file my self or is there somewhere in DH Control panel that I can add to? It’s because If i edit manually and than later down the road I do a DNS info update through the DH control panel, wouldn’t my manual edits disappear?

Thanks - PiNG