How do I actually play the SC2: Legacy of the Void Beta?

I've purchased and claimed the Legacy of the Void Beta, such that my account details show it against my account:
Clicking on that icon takes me to this page with information about the Beta, however there's nothing to indicate a 'Download the Beta now' or instructions on how to play:
The Battle.Net app also doesn't have any indication of how to launch the 'Beta' mode, so I assumed it was accessible after launching Starcraft:
And yet there's nothing after launching the game that screams "Access the Beta content by clicking here right now!" either (unfortunately screenshots of the game menu seem to fail so I can't show this).
Of course, my Google-fu is failing me: everything I find simply tells me to pre-purchase the game, or how to pre-purchase the game, without any indication of how to actually launch and play it.
So, How do I actually launch and play the Beta and/or the Prequel missions?
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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.How do I install StarCraft 2 Legacy of the Void?
The Legacy of the Void StarCraft 2 campaign won't be free according to Reed.Can you play Legacy of the Void for free?
StarCraft\xae II is available free to play, with additional single player, co-op, and cosmetic content available for purchase. Upon account creation, StarCraft II includes the following: The complete Wings of Liberty campaign.LEGACY OF THE VOID BETA! (StarCraft 2)
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Images: Mnz, Brett Jordan, Brett Jordan, ROMAN ODINTSOV