To add static about page to octopress blog, assuming that octopress has been already setup:

Create the page from the command line:

rake new_page["about"]

You can now edit the page at ./source/about/index.markdown which should look like:

---
layout: page
title: "about" 
date: 2013-05-19 09:04
comments: true
sharing: true
footer: true
---

Add the link to the site navigation menu.

Edit source/_includes/custom/navigation.html from :

<ul class="main-navigation">
  <li><a href="/">Blog</a></li>
  <li><a href="/blog/archives">Archives</a></li>
</ul>

To (adding about link):

<ul class="main-navigation">
  <li><a href="/about">About</a></li>
  <li><a href="/">Blog</a></li>
  <li><a href="/blog/archives">Archives</a></li>
</ul>