New to Direct TV/Using my TIVO...not interfacing?

I just got Direct Tv...quit Comcast. But now my TIVO (Series2 Single Tuner DVR-no cable box) will not interface.

The Dtv guy said everything should work fine but when I go through the Tivo set up, it knows I'm using a Direct tv receiver and it asks me to choose the channel changing tools I will use: serial hook up or IR cable.

I see these port options on the Tivo box however neither option is available on the Direct TV receiver. Is it necessary? I do see a USB port on both but it isn't indicated in any way in the directions

How do I connect a standard Direct tv receiver to my standard TIVO? Please don't tell me I'm going to loose my ability to use TIVO (I LOVE my TIVO)...I'm in a two year contract with Direct. HELP PLEASE.