Bi Wire Question

The NAD has preout Jumpers.
In my room the 7020 NAD outperforms my Carver M500t @250 watts.

Can anyone actually answer my question from a "hookup" perspective?

Did I say I was looking for more power?

We are not talking Bi Amping folks.
We are taliknig Bi wiring.

"...Did I say I was looking for more power?..."

No, you didn't, nor did you tell us the reason you want to use bi-wire and both taps. I was just guessing. Still am. 
If you run both taps on most receivers, it will run the amp at half the impedance. Probably not a good idea on an old amp. There is really no need and you will not get any benefit out of it. The other thing to consider is that a better single run of cable will sound better than two runs of a lessor cable. I hope something I said helps but I'm still in the dark. 

So bi wiring.....no benefit?

https://www.audioadvice.com/videos-reviews/speaker-bi-wiring-bi-amping-explained/

I assume I can use both A and B sets?
If so.....from the A section on Receiver say left channel....a run from receiver + to high pass + on speaker and from receiver - to lhigh pass - on speaker? Same for right.
And from B section on receiver the same as above but will be going into low pass of speaker?

Yes, you can use both A and B.
The speakers selector on your NAD 7020 Receiver will works as a jumper, you need to switch the speakers selector to A+B.