No problem. You can and should simply go back and edit your original post. Follow the basic example in this faq on how to add formatting using <p></p> and <code></code> tags: How do I post a question effectively?

Additional formatting tags are available here, Perl Monks Approved HTML tags, but the former are all one normally ever needs. You can even use the reformatted text that I provided in your original post.

Each of these faqs are linked to below the textarea where one posts a question. There are other resources available there too.

Finally, one caveat is that you should add an "Update" note at the bottom of your post whenever you make a change. Especially to a question node.