Are you sure you're logged in? When you pull up the Edit Your Data, etc. page (or you can also do it from the first page that comes up after you log in) you should see your username already listed with a red star near the very top, and then below it a box for your password, then a box to re-enter your password and then a box for your email address...all have red stars by them. All you need to do is enter your new password, re-enter it, make sure your correct email address is indicated, and then click on 'Update Profile' at the bottom of the page.
My apologies about the blog edit info. I was in moderator mode when I checked, and I now see that you do not have the same buttons. But I am sure there must be a way for you to edit your blogs. I'll do some research and make sure you get the answer you need.