// Load saved data into the following variables:
var defaultUsername = "";
var defaultPassword = "";
var defaultEmail = "";

var username = await KeyboardInput.Show("Name", "What's your username?", defaultUsername);
var password = await KeyboardInput.Show("Password", "What's your Password?", defaultPassword, true);
var email = await KeyboardInput.Show("E-Mail", "What's your Email?", defaultEmail);

// validate and save if the values do not match the defaults above