You can use any HTML or plain text code. You can also use the following tags.
[email]
The input element for the email part of the login.
[email-name]
The value of the name attribute of the email input element.
[password]
The input element for the password or order id part of the login
[password-name]
The value of the name attribute of the password or order id input element.
[submit]
The input element that is the submit button.
[link]
The forgotten password link
[link-urlonly]
The url part of the forgotten password link