Add user account dialog is a bit ambiguous

Attached below is a screenshot of the add user account dialog. I feel like it is missing the following,

- Text placeholders for the textfield to guide the user to enter his username and password. While it might be obvious, some places use their email address and password while in others they use username and password.

- It might be better to have "login" instead of "save" as the button text.

- When the focus is on either of the textfield, the appropriate keyboard should be shown. For instance, in the username field, the auto captilization should be disabled since all usernames start with lower case. Also the password textfield does not seem to mask the characters I type.