Just follow the instructions in that post, it works... The confusing part is the "use Dynadot DNS" button. It implies you will be using dynadot instead of your hosting nameservers, but that's not what happens.
Hi, Same question! (EDITED) Sorry, :) I see it now -> https://www.dynadot.com/account/forum/f7-domain-name-help/how-to-create-a-subdomain-on-dynadot-6372.html
[This post has been edited by callmecrazy on May 24, 2011 11:56am.]