I'm not sure exactly what you mean about not being able to access the comments section to write your post. The comments section should be separate from your actual blog post. Can you explain in more detail exactly what happens when you access http://www.trulia.com/blog/post/ ?
Also, please note that Trulia does not include FSBO listings within our search results at this time. We apologize for any inconvenience this may cause.
You should have a professional list your home and sell it. If you pick the right agent your home can be places on many sites, mls and get exposure you could only dream about getting. Trulia is for agents to list homes, I don't beleive they let private home sellers list homes for sale on this site.