GoDaddy Documentation: https://www.godaddy.com/help/forwarding-your-domain-name-12123
Forwarding:
- Login to Godaddy
- Next to Domains click Launch
- Choose Connect to Website. If already connected choose Settings > Connect to Website
- Paste your flex link in the 'Somewhere Else' box
Masking:
- In the Domain Manager, click on Manage Connection
- Choose Update Forwarding
- Choose Redirect type of Permanent (301)
- Under Forward Settings choose Forward with Masking
- Fill in your Title, Description, and Keywords