You’ll need to do two things:
- Include the relevant scripts; search on the forums, there are tons of ways to do this, and you can see what folks have done
- Include the
div
in the templates where you were going to include the other commenting widget
We don’t advise on general web tech here, but we do have a Recommended Reading Reference, and to get started with theming, we have lots of docs. You can also check the theme directory to see how they do things.