I've sent invitations to a few people to become 'authors' on the blog. I suspect you'll need to create a blogger account, but you'll be directed when you get the email. This is a way for you to post on the site. You can also click on 'comment' at the end of each post if you want to reply to the post. If anyone else wants to be added to the authors list, send me an email and I'll add you.
Cheers,
Annie