I'm afraid you haven't given us much to work with. Tell us what, exactly, you are trying to do.
What, for example, does your DVD player have to do with your DVR?
Basically, I would say that your DVR has two sets of outputs.
Send one set to your TV. Send the other set to the VCR so that you can record from the DVR.
Hook the VCR up to a second set of inputs on your TV.
Hook the DVD player up to a third set of inputs on your TV.
But, beyond that, you haven' really given us enough information.
What, for example, does your DVD player have to do with your DVR?
Basically, I would say that your DVR has two sets of outputs.
Send one set to your TV. Send the other set to the VCR so that you can record from the DVR.
Hook the VCR up to a second set of inputs on your TV.
Hook the DVD player up to a third set of inputs on your TV.
But, beyond that, you haven' really given us enough information.