Problems with podcast

[ziorip]

Hi all, first of all I take the opportunity to introduce myself, I just joined this forum :)

I have a problem with podcast. I subscribed the Pixel Perfect podcast in itunes, I would like to download also the firsts episodes (into the podcast) but I can't.
How can I make appear the firs episodes in the list if I download them manually from the site?

Thanks in advance and sorry for my English.

Byes!