Fill and submit the form and await response from the Co.; if you don't hear from them within a week - inquire by email.
My understanding is after you fill the form, then RokuCo will move the process, contacting the Dish behind the scenes - and getting response from Dish may take a few weeks (or months). I think D****World have some kind of "right of first refusal" in their contract with RokuCo, so D/W will be asked if they'd carry the specific content and if they don't, you are cleared to.