There will be 6 of us traveling from Nuremberg to Prague following a river cruise. I've been on the Bahn.de website, but it seems I can only get a maximum of 5 tickets unless I use group rate. Can someone educate me on this - any help/advice accepted! Also, it seems if I order tickets online, they will be mailed. That is a big concern.

If you use the group rate, you just need to fill out the contact form and a rep will get back in touch with you.

The alternative is to buy 4 tickets then buy two tickets.

They can mail the tickets to your hotel.

How soon do you leave for Europe or are you concerned for other reasons?

I probably have adequate time for tickets to arrive by mail, but just concerned that they won't!

Bus is faster...Leaves right outside the train station...
Have a good trip!

Nowhere did OP or anyone else say train. The more than 5 persons rule also applies for the DB express bus. And what's more is that right now it is not giving prices for the Nürnberg-Prague express bus ("unknown tariff abroad"). The price is normally around 70 Euro per person round trip.