Can't save contacts on my Android phone

Can't save contacts on my Android phone

Using the Zoho mail app on my phone, I don't see an option to save contacts.  Example.  I receive an e-mail from a friend.  I see no way at all to save him to my contact list.  I've tried everything.  What am I missing?  There is only one contact in my contact list and it says it's there because the contact is used "frequently"   Anyway.  Thanks.  P.S. I just signed up yesterday, with a free, individual account.  Nothing fancy.  My desktop Zoho mail works fine and stores contacts.  Just not my phone.