Step 1: Login to your WHM panel and click the "Edit DNS Zone" link (Under DNS Functions.) Then Select the desired domain name from the "Choose a Zone to Edit" list.
Step 2: Under "Add New Entries Below this Line", enter this information:
In the first blank: type your domain name (without the www), then add an extra dot at the end.
Do not change the TTL 14400.
In the "Select" drop-down: choose TXT
In the "Text Information" box: Update the TXT or SPF record to "v=spf1 a mx include:dqhosting.com.au ~all" (Replace "dqhosting.com.au" with your domain or IP address)
Then Click the "Save" button at the very bottom of the page.