How do I show the archive button instead of trash in Mail?

I want archive to be the default behavior. Right now, because gmail and iCloud both show different buttons, the swiping behaviors are opposite of each other. When I swipe left on gmail it deletes, but archive on iCloud. When I swipe right on gmail it archives, but deletes on iCloud. It's very annoying.

I think the problem is with defaulting to archiving or trashing.

This support page tells how to change it on iCloud.com, http://support.apple.com/kb/PH2652 but I can't find anything for iPhone. I see nothing in settings. I feel like it's right under my nose.