First, you do not need to do anything. The SWM system you have will support 8 tuners. Just connect the HR34 in place of either current unit, or on the third unused line.
Personally, since it costs $6 for either a DVR or a receiver, I would keep the DVR, and the HR34, and send back the receiver, unless the ability to schedule recordings from the second room is an absolute necessity. Since you are paying for it anyway, no reason not to have two tuners and a DVR, instead of one tuner and no trick play.
Cheers, and welcome to DBSTalk.
Personally, since it costs $6 for either a DVR or a receiver, I would keep the DVR, and the HR34, and send back the receiver, unless the ability to schedule recordings from the second room is an absolute necessity. Since you are paying for it anyway, no reason not to have two tuners and a DVR, instead of one tuner and no trick play.
Cheers, and welcome to DBSTalk.