I have yet to write one myself, but I believe this will help....
Go to your "HOME" page on the top menu bar.
Click on "blog" in the "View my:" quick link on the right side of the home page.
Click on "Edit my Blog"
Click on "Add a new Blog Article"
and fill in the info from there.
Good luck, and I look forward to reading your blogs. Also, welcome to the site!!!