Help with verification of domain for Zoho Mail

Help with verification of domain for Zoho Mail

I host my site http://www.paperskyhome.com @ shopify.com

I bought my domain name at ewebguru.com

I want to make an email address info@paperskyhome.com using zoho mail. I have selected the basic Free plan. They are asking me to verify that I am the owner of the domain.

I tried uploading the verifyzoho.html to paperskyhome.shopify.com but it shows an error.
I do not know how to verify with CNAME or text file.

Please suggest a solution.