Just like Game 2 of this series, the game has been pushed to NBCSN, so you might have to do a little digging to find the game, if you aren't used to watching games on the cable network, as opposed to the big NBC channel. It's Dish 159 and DirectTV 1220, but be sure to check your local listings as well if you aren't sure.
There will be an online stream available here on NBC's Live Extra feature, but you'll be required to login with credentials (e-mail address and password) from whatever cable service you subscribe to.
For our international friends in Canada, CBC is your answer. Outside of Canada, you folks are big enough fans to be tuning in that you've probably got more knowledge on this than we do.
As far as radio goes, if you're local in the Pittsburgh area, you can get Mike Lange and Phil Bourque on 105.9 The X. If you're outside the region, you can access this stream for free on their website, or you can stream this via the Penguins official app.
Time: 8:00 pm ET. Well, that's at least when the game will "start" on NBCSN, but it seems like the actual start times have been closer to between 8:20 and 8:30
Radio: 105.9 WXDX (listen online)
Stream: NBC Live Extra