How do I play the prologue missions from prepurchasing Starcraft 2: Legacy of the Void?

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I just prepurchased Legacy of the Void so I can play the exclusive prologue missions (I have no interest in multiplayer). However, I cannot find them anywhere in my campaign list in Starcraft 2. I've seen people play them on Youtube, but I can't find them.
Do I need to install the beta to play them? Do I need to wait for my account to get flagged properly? Or is there something else going on here?
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How many missions are in StarCraft 2 Legacy of the Void?
The main campaign features 19 missions, with an additional two extra mini-campaigns featuring three missions each. An additional three mission campaign, named Into the Void, serves as an epilogue for Legacy of the Void, and as a conclusive end to the story arc started in StarCraft.How do I access Legacy of the Void?
If you guys are just wanting legacy of the void log into your account and go to the start campaign option for the game. It will ask you to purchase the game for 14.99. You get the game and you don't have to wait for it.Does Legacy of the Void include Heart of the Swarm?
The game was released on November 10, 2015. The expansion includes additional units and multiplayer changes from StarCraft II: Heart of the Swarm, as well as a continuing campaign focusing on the Protoss race.Is Legacy of the Void campaign free?
The Legacy of the Void StarCraft 2 campaign won't be free according to Reed.StarCraft 2: Legacy of the Void - Brutal Mission #1 - Dark Whispers [Prologue]
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