Edit RSS to import from another WP blog

I’ve figured out how to import my old entries from a past domain to my new domain.

Well, i only imported 10 entries. HOW can I edit the RSS file to update ALL of my old entries? I’ve looked at the actual RSS file, nope nothing to change there. I’ve also looked at the blog/wp-admin/import/rss.php file and I have NO clue where to change the coding to make all of my entries import.

My question is how do I edit the RSS file to import ALL of my entries from my old wp blog?
thanks