STEP 1 : Login to Direct Admin ( Guide here )

STEP 2 : Navigate to Account Manager -> DNS Management. Click on DNS Management

STEP 3 : Add your new TXT Record, by clicking Add record at the top the DNS Management page

STEP 5 : Select TXT as the record type

Insert the Name/Value as you wish

Click on the Add button after you are done

STEP 6 : Upon completion, you will be greeted with a Record added message at the bottom right of the screen

STEP 7 : You can check the new records via Account Manager -> DNS Management. Click on DNS Management.

Please allow up to 24 hours for DNS propogation to occur