Having trouble connecting domain to another host

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I am having trouble connecting a subdomain to another site.

Domain is under Shopify. 


This is what I am trying to achieve: 

www.site.com <- points to main site/shopify 

text.site.com <- points to subdomain/cms 


So far I created the subdomain on Shopify

I have it pointing to the IP of the other address as a A record

I was then told to add a CNAME record but the values they told me to input weren't working and received an error, "Value must be a valid FQDN". Read up on that, got kinda confused.


Any help or direction would be appreciated!