If you had an account on the old site, you still have one here. The login name will be the same, although it will be case-sensitive now. Furthermore:

• There is a login button at the top now – use it!
• Once you login, the site should remember you and you won’t have to keep typing your email, etc. to leave comments. 
• When logged in, you’ll get a much fancier editing window for typing comments.
• You can edit a comment after posting it now.
• You can add an image to a comment, but only by linking to it via its URL. This means it must exist on a website elsewhere. Look for “Add images to your comment” link below the textbox.
• You MUST be logged in to post a new post (appearing on right-hand side). Otherwise you can only leave comments.
• If you have something long-form you’d like to write for the blog section (left-hand side), let me know.
• If you have trouble logging in or need a new password, let me know and I’ll fix you up.
• Get a gravatar account and make an avatar. It just requires your email and they don’t spam.