Login to Cpanel and on the left scroll down to DNS Functions
click edit DNS zone
click on the domain you want to see the records for
find default._domainkey and copy the record (it will be a very long string of characters)
paste it into notepad and you will need to delete a few things for it to be compatible in GoDaddy
at the very end delete \;
then from the end scroll left and stop when you get to the ” mark
here you will delete the ” mark and the space after the ”
Delete the ” at the very beginning as well
after that you can create a TXT record in GoDaddy with the host as default._domainkey
then paste in the corrected value
you can test if working correctly using dkimvalidator.com