This gives a step-by-step guide how you can claim Google authorship for your blog.

1. How to Claim
Google Authorship
For Your Law Blog

2. Part 1: Add link to your Google +
profile

3. Step 1. Go to Google+ profile and then choose
the “About” tab.
Step 2: Scroll down on the “About” page until
you’ve reached the “Contributor to” section, look
for “Edit” and click on that.
Step 3: Under the “Contributor to” section click
the “Add custom link”; add the website address
you want to claim authorship on even if your
claim is just for a sub-page or guest post.
Step 4: Click “Save”.

4. Part 2: Add a link to your Google+
profile via webpage to claim
authorship of the entire website

5. Method 1:
Add a link in the header of your webpage. This
approach will require an HTML editor.
Add the link in between the opening and
closing tag with the href tag including a link to
your Google+ profile.
Likewise, make sure the link you add shows the
ref = “author” tag in it.

6. Method 2:
Use Word Press plug-in that helps integrate
Google+ authorship link.
Step 1: Install the plug-in
Step 2: Go to your Word Press dashboard
then click “Users”, then “Profile”. On the field
provided include encode your Google+ profile
URL
Step 3: Save by clicking “Update profile”

7. How to do a back check on your
Google authorship:
Step 1: Go to
http://www.google.com/webmasters/tools/ri
chsnippets#sthash.a9EENDeE.dpuf
Step 2: Encode the webpage or URL you
want to check and click “Preview”
Step 3: You should see a search engine
result with your image on it

8. Click here
for the full post.