At the bottom of each submissions post is this paragraph:
Oh writers of Medium, show your wisdom in one great quote and have the chance to become part of a published collaborative book! Send in your submissions or nominate someone else in the comments below. If you’re shy, send me a private note, or email me here.
Not to get too techie on you, but that underline thingy above, is a link which will open up a new window thingy which leads you to this newfangled message technology known as an email. Try it. It won’t bite, but it may mega-byte.