Namecheap

All a sudden my domain nolonger linked to my account. Now namecheap changed I am requested to put in a ip or so according to this site https://www.namecheap.com/support/knowledgebase/article.aspx/768/10/how-do-i-register-private-nameservers-for-my-domain is their another way? what is the ip for zoho mail?