How do I set a default email address for recipients using my iPhone ?

How do I set a default email address for recipients using my iPhone ?

I have contacts with multiple email addresses. I need 1 of the addresses to be their default address while keeping the 2nd an 3rd email addresses available when needed. Right now the 2nd email address is the one coming up when I prepare emails. How do I change this to default to the one email address I use most of the time? The problem is with individual contacts with multiple emails (this is not a group mail issue). I should be able to identify a default email that the mail program uses. It does not use the first in the list nor is there a way I am aware of to identify default email address. I read one solution is within Contacts, edit the contact and re-arrange their email addresses, so they are in the desired order, i.e., the primary email you want to use is first. That doesn’t work either.