<form
method="post">
<input type="text" name="email" placeholder="email" required autofocus>
</br></br>
<button type="submit" name="login">Post</button>
</form>
а после нажатие кнопки появилась
<form
method="post">
<input type="text" name="license key" placeholder="License key" required autofocus>
</br></br>
<button type="submit" name="login">submit</button>
</form>