Login to your GoDaddy
Under 'Domains' section, click the green 'Manage' button
Click the domain you would like to edit
Click 'DNS ZINE FILE' and than 'Add Record'
Select CNAME from within the dropbox
Enter your CNAMES values (can be found on application screen--> your app. click on the '?' bext to the DNS settings fields.
Click 'Save Changes'