This does not answer my question. I was not asking about how to get iCloud mail on my iPhone and iPad. I was asking how to have the same mailboxes I've set up in the Mail app on my Mac appear in the Mail app on those 2 devices as well. Without being able to do this how am I supposed to find emails on my mobile devices which I have moved to the various folders I've created on my Mac?
My mobile devices Mail apps are set up to send and receive mail from all my email providers -- iCloud, gmail, Cox. On my Mac I put important stuff in a folder called "save", but when I'm on my mobile devices I can't find these emails.