I am trying to accesss my zoho code

I am trying to link my new website to forward emails to my email zoho web hosting. I receive the below request on my shopify settings. Can you please tell me how I receive this on my zoho account. my email is enquiries@shinebrightcleaninguk.com

Before you can enable Zoho Mail, you need to verify your domain. Log in to Zoho Mail and follow the steps provided. To verify, enter your Zoho code below.