Are you using wordpress.com or your own wordpress site?
For blogger its easy. Just include the insert code in the header widget. Of course, you have to have it hosted on your own domain first. I've never tried it with a free web host, but it may work.
If you are using your own wordpress site, just switch the post to html mode and include the insert code at the very top of the post. Make sure you use the full path even if the code is located on the same domain.
Alternately you can also use a header plugin to accomplish this, but again make sure you use the full path of the lock.js file.
If you are using wordpress.com, then I'm not sure because I have never used it that way, but it should be somewhat similar to one of the methods I outlined above.
Hope this helps