(A). You have to be logged in to post.
You have to make an account if you do not have one, but it is very easy. Click on login then register.
You will get an e-mail.
You need to validate your e-mail address by clicking on the link in the e-mail.
That's it-now start posting.
(Q). Now that I have registered and have an account - what next?
(A). Click on login.
Look in top menu for "Write" and click it.
That will let you write your post/blog.
Click "save" and logout.