How to turn off Word Verification
1. Sign in to your blog
2. Click on 'Customize'
3. Click on the 'Settings' tab
4. In 'Settings', click on the 'Comments' tab
5. Scroll down until you see 'Show word verification for comments' and make sure 'No' is checked
6. If you are worried about 'spam' comments, and want to moderate comments before they are published on your blog, check the 'Always' box next to 'Comment moderation' (just above where you've just turned off word verification), and enter your email address
7. Click 'Save Settings'
It's really very simple to do, and it makes leaving comments on your blog a much more pleasant experience for your visitors :0)
For those who may be using the new blogger interfaceThe option to turn off word verification is not there. You have to click on the setting symbol and change back to the old interface and then follow your instructions to turn it off, save and then switch back to the new interface.