Can someone fix this code to allow comments?

Hey guys, here is the code for my blog, I think. A friend built this site for me, and now we are not on speaking terms, so I can’t get him to change anything. Can anyone fix this code to allow comment posting on my blog? Here it is:

[Large code excerpt removed by moderator. Per forum rules, please use the pastebin for all large code excerpts. It works better anyway.]