You add nothing in that reply. Perhaps I should have been more precise and directed you to the questions from "shamus mcquail" which appear relevant to me. Note that no one posted answers to them so they move no further towards a solution.
How did you embed it? Did you embed it into a post or a page? Did you copy the code to the compose tab, or the HTML tab? It needs to be embedded into a new page, only for the forum. When you create the new page, you have to copy the code into the HTML tab. Let us know.
These questions mean little to me as I am not a blogger user, but they seem relevant.
You could try posting your responses to that topic, and it may be worth alerting Shamus by emailing him direct, in case he is no longer monitoring the topic. (Click on his user name. This will take you to a screen where you can direct him to your post.)
If embedding doesn't work for you, it is far more likely to be an issue with the site in which you are trying to embed the forum. That is why I normally guide people to the support service of the tool they are using to build their web site.
A quick Google reveals other possible sources of help:
http://helplogger.blogspot.co.uk/2013/10/create-blogger-forum-using-nabble.html
http://www.bloggersentral.com/2009/12/adding-forum-to-blogspot.html
Have you tried the approaches suggested at either of those sites?
Whatever you do, report back. Otherwise we'll just get more frustrated Blogger users, going away before revealing the solution.
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NAML