If you're following along with part 2 of the article on my website, you'll need look at the source code where the error is and use context to help determine which file it's in, or whether it's in the text of a post or page, in which case you'd actually go to the WordPress editor to fix it. Here's an example:
<table><tr><td>Here at <span style="color: #8d2b2b">Redcon</span> we are interested in what you as the client think, about us, about the property market in South Africa, about investing or whatever else might be on your mind. Please feel free to discuss these with us by leaving a comment. We will answer every comment if they require feedback.
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<p/>
I've bolded the problem tag, which should be < /p> (without space)
not<p/>. It looks like this erroneous tag might actually be in the text of your post. So go to the post editor, switch to HTML view, and see if you see the tag there. Fix it and move onto the next error.