Ok, so this is my problem, Once upon a time ago, when I first set up MT 5, I customized it to my liking. When I did that I removed or blocked out any code I did not want to appear on my blog. Now for most of the unwanted code, I did indeed comment out the code and left it in place should I ever want to revert to it. However for the code that allows users to comment on my postings, seems I deleted it completely out.
Now I would like to allow commenting on my blog, but I cannot figure out the code for it, I set up a new blog, so that I could look over the code, but I cannot find it or understand it. So, does anyone know what snippet of code I need to install and allow commenting on my site again.
Thanks,
Richard
Reported on Movable Type 5

Short answer: I don't use mt5, but in 4.x you would check your Preferences-->Comment and check "Accept comments" and configure who you'll accept them from and how.
Then look in Design--> Templates for the template module Comments. Include it in your Entry template. Republish.
Shouldn't be that different.