Check the text message or email that was sent to you as soon as you finished creating your account. Both the text message and email will contain an image that is your new phone lockscreen, ready to download.

Open the lockscreen image on your phone from the text message or email attachment. Select the "share" blue icon in the bottom left and then from the drop down menu options select "Save Image".

Open the "Photos" app on your phone and find the lockscreen as the most recent image. Select the photo and then select the "share" blue icon in the bottom left. Then from the drop down menu options select "Use As Wallpaper".

You can not pinch and crop to resize and show your lockscreen as you like. Once you have the QR code in place, simply click on the blue "Add" button in the top right to compelte the process.