How does Writer merge with CRM?

I see the new blog post about the new integration of Writer and CRM and Mail Merge.

From reading the blog its suggesting that the features are accessed within CRM. I've been trying to find out where or how to get this to happen.

Can you direct me or link me to a "how to" page?

Thanks.

https://blogs.zoho.com/general/new-in-zoho-crm-mail-merge-in-the-cloud-with-zoho-writer-integration