Go into the source/_posts directory
Click the + next to "website2014 / source / _posts / " that says "Create a new file here"
Name the file yyyy-mm-dd-title-of-post.markdown
Put the following block at the top of the file:
--- layout: post title: "Title of Post" date: 2014-04-01 10:08 comments: true categories: author: My Name ---
Write your post below that, using Markdown syntax.
Images are a huge pain in the ass. Please at least indicate where you would like them to go. Better yet, if you could handle resizing them, that would be swell.
{% img center /images/photos/whatevs.png %}
Then click "Commit new file", and bother somebody re: this new file you've committed.