Follow these steps to add SPF and DKIM to your domain in GoDaddy.com

• Login to your GoDaddy.com account. 
• Go to My Products

• Under Domains, click the Manage DNS button next to the domain you want to add email authentication to. 

• Click the DNS ZONE FILE tab.

• Click Add Record and add a text record using the Host shown below along with your TXT Value provided to you:

• To add the SPF record, click "Use classic DNS Manager".

• Click "Add SPF Record"

• Select "GoDaddy.com and an ISP" from the select on top. 
• Click the Outsourced tab. 
• Add "spf.mailjet.com" as shown below.