My wife and I administer a blog jointly but use a single email address. So far I have been doing the posts and comments (aprt of course from subscribers). She wants to write a post, but WordPress is only remembering my password, and if she does a post it shows up under my name. I have tried clicking on "Sign Out" to let her sign in, but nothing happens. The site thinks I am the only administrator. How do I fix it for her to post?