That is what the documentation directs to do as well, but I really don't see an option for that. There is an "enabled paid features" tab which the self hosted tab gives the three options none of which are SMS. The only other part of the dashboard page is "getting started" but when I click the self hosted option, it simply links to the documentation page and does not provide any more steps. I would think this would be where the option to create a dev and prod account are, but I do not see them anywhere.