Well, first, as for problem of people can not reach your website unless the type in the “www”, I believe this is because of the way your DNS for the domain is configuerd. Make sure you have CNAME records for both the domain.com and http://www.domain.com! A good way is also using the wildcards like *.domain.com in the DNS; this will make sure that requests for both the www and without the www to be redirected to the blogger server.
I just did a whois on your domain and see that you only have a CNAME for http://www.yourdomain.com redirect to ghs.google.com, just add another CNAME for yourdomain.com redirecting to the same ghs.google.com and this should do the trick

As for applying my method of removing the ‘www’ from the URL when a request is done using the ‘www’, unfortunately, this will not work in the case of Blogger due to the fact that you do not have access to web directory; as this is hosted by Google’s servers.
However, I believe that blogger’s settings should allow you to choose the custom URL and enforce that by default in the configurations.

I have a few questions.
1. Does this method work for blogs/sites hosted on Blogger?
2. If yes, where do I find the root of web directory to paste the code?

I appreciate your help.