I wrote a post on IP banning in this post How to ban a person from your blog or Website. It involve putting a code into the template. However, adding code into beta blog template is a different kettle of fish, and I want to test to see if adding the code via "Add a Page Element" will work, and I am going to ban my own IP. I am going to try it now.
Well, it worked. After successfully adding the script (Add a Page Element), then when I try to save the Layout, an error message appeared "An error occurred. Please try again). I didn't do anything, but the thing still worked. I tried to get into this blog (in another tab). I saw my page momentarily, then was redirected to another page (which you can choose). It put a button
in my sidebar (saw it momentarily) which will no longer be visible when you view my blog as I am going to remove the script when I finish this post. (Turned out the IP blocking is actually a redirect). I don't want to ban myself from my own blog permanently. So, even if your blog is a Blogger Beta blog, you can block people from viewing your blog by placing the IP block. Just follow the method outlined in How to ban a person from your blog or Website