It should work that way, childton. Can you tell us your URL (the part after index.php) and what each part means? For instance, in that example:
blog = template group
comments = template name
147 = entry id
or even the full link to the page would be great?
Also, I would encourage you to create a totally blank template, and place this in it:
{exp:weblog:entries weblog="default_site" limit="10"}
{title}
{/exp:weblog:entries}
view rendered template - that should show the last 10 entries. Then append an existing entry id or url_title, and it should show only that entry; you can read more about that in The Importance of Semantics.