Connect to hidden wifi

It's the "+" button in the row of buttons at the bottom of the screen. With Wi-Fi on, I have Add, Select and Delete. With Wi-Fi off, the Add button is not there.
 
Hmm... must have been something in an update you didn't get.

My Lumia 900 reports OS version as 7.10.8779.8
 
I'm stuck on 7.10.7720.68

Done all the Zune trick(s). My Dell Venue Pro will not go beyond the 7720 update.
 

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