This is actually very simple process if your domain and can be verified incredibly quickly via Google's Webmaster Tools.
- Within your Google+ profile "About" page, detail within the "Links - Contributor to" section your domain
- Identify your user profile number or unique URL, detailed in your profile link
- Create a link to your Google+ profile by replacing [profile no] in the following code with you profile number (ignoring the brackets)
<a href="https://plus.google.com/[profile no]?rel=author">Google</a>
- Once published your page authorship can be verified via the Structured Data Testing Tools
For more information or if you want to link your email address too your content (only if the email address is on the same domain as your site) follow the link