I Can't Add a Comment Box

I took a lot of time reading some articles regarding adding comment box in blogs if using classic template and I was so disappointed that any codes aren't working. I can even count my sweat drops as I browse every single page in their blogs. This is what comes out every time I paste some codes.
Here's the codes;

I was so thankful because they have shared this stuffs, yet I was disappointed that it didn't work in my blog. ><

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