ch01: update bluewallet receive screen

ch01.asciidoc

@@ -147,14 +147,14 @@ Never attempt a "DIY" security scheme that deviates in any way from the best pra
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 [[bluewallet-welcome]]
-.The Bluewallet Mobile Wallet
-image::images/bw_0101.png["BluewalletWelcome"]
+.Alice uses the Receive screen on her Bluewallet mobile bitcoin wallet, and displays her address to Bob in a QR code format
+image::images/mbc2_0101.png["BluewalletWelcome"]
 
 ((("addresses", "bitcoin wallet quick start example")))((("QR codes", "bitcoin wallet quick start example")))((("addresses", see="also keys and addresses"))) The main wallet view displays the bitcoin amount, transaction history, and _Receive_ and _Send_ buttons. In addition, many wallets feature the ability to purchase Bitcoin directly through an exchange or similar service where you can offer fiat money in return for cryptocurrency, which is done by <<bitcoin_price>> and selling to the wallet user at or above this price. The _Buy Bitcoin_ button would allow Alice to purchase Bitcoin in this fashion.
 
 Alice is now ready to start using her new bitcoin wallet. ((("", startref="GSquick01")))((("", startref="Wquick01"))) Her wallet application randomly generated a private key (described in more detail in <<private_keys>>) which will be used to derive bitcoin addresses that direct to her wallet. At this point, her bitcoin addresses are not known to the bitcoin network or "registered" with any part of the bitcoin system. Her bitcoin addresses are simply random numbers that correspond to her private key that she can use to control access to the funds. The addresses are generated independently by her wallet without reference or registration with any service. In fact, in most wallets, there is no association between a bitcoin address and any externally identifiable information including the user's identity. Until the moment an address is referenced as the recipient of value in a transaction posted on the bitcoin ledger, the bitcoin address is simply part of the vast number of possible addresses that are valid in bitcoin. Only once an address has been associated with a transaction does it become part of the known addresses in the network.
 
-Alice uses the _Receive_ button, which displays a QR code along with a bitcoin address. The QR code is the square with a pattern of black and white dots, serving as a form of barcode that contains the same information in a format that can be scanned by Joe's smartphone camera. In most wallets, tapping the QR code will also magnify it, so that it can be more easily scanned. Next to the wallet's QR code is the bitcoin address it encodes, and Alice may choose to manually send her address to Joe by copying it onto her clipboard with a tap. Of note, when receiving funds to a new mobile wallet for the first time, many wallets will often re-verify that you have indeed secured your mnemonic phrase. This can range from a simple prompt to requiring the user to manually re-enter the phrase. 
+Alice uses the _Receive_ button, which displays a QR code along with a bitcoin address. The QR code is the square with a pattern of black and white dots, serving as a form of barcode that contains the same information in a format that can be scanned by Joe's smartphone camera. Next to the wallet's QR code is the bitcoin address it encodes, and Alice may choose to manually send her address to Joe by copying it onto her clipboard with a tap. Of note, when receiving funds to a new mobile wallet for the first time, many wallets will often re-verify that you have indeed secured your mnemonic phrase. This can range from a simple prompt to requiring the user to manually re-enter the phrase. 
 
 [TIP]
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