Are you a fan Karen? You could message one of the admins and ask them to add you as an admin, then you can add content etc. I think it is reasonable that you be an admin of your own business
In fact, if I were you I would ask them to add you as an admin and remove themselves, as it is kind of weird that it is set out as a business page (rather than a fan page) yet you aren't involved.
I like it when businesses use facebook, as then sales, new products etc. show up in my news feed, rather than having to go and check a separate blog/forum. I'm on this forum all the time (lol) but if I weren't I would find it easier to keep up with the facebook page rather than your blog or the website.