On with exploring the various Roku channels. Mediafly is a big confusing mess, at least it is to me. You can register with mediafly.com and build up various shows in your account that will then show up on the Roku if you link your accounts on the Roku (Mediafly>Manage Users). You can also browse popular video and audio shows and search for shows via the Roku.
brings you to a alpha-numeric input screen so you can type in your search terms. If you type in "hot for words" you will get some results (the first of which was not "hot for words", but "One word review of hot pockets barbeque beef" = FAIL)
So then if you click on one of the episodes of Hot For Words you can either play that episode, or more importantly "view other episodes". Then you can watch any of the episodes of "Hot For Words". The "Onomatopoeia" episode is as good a place to start as any.
There doesn't seem to be a way to add the episodes to your account via the Roku. There's a lot of content on Mediafly so it's a good idea to check it out at your leisure. But start with Hot For Words, you (probably) won't be sorry.