There are submission and/or edit buttons scattered all around the site, primarily on the episode pages. If you can't find them, let us know what you're trying to submit
Keep in mind that Being Human (UK) and Being Human (US) are two different shows, though, and have different sets of airdates. And that all primary airdates for American shows are for the American air dates.
Also make sure to put in your submission notes what your source is, so that staff can double-check.