Redmine

I want to add button to the login page on my Redmine 2.3, but I don't know where exactly this code is placed.
In the attachment I'm added screenshot where you can see that login form with login and password placed in the table , but where is that table? I need to add one more raw to it.

In the file base.html file that is placed in app/.../layouts I found this code, but this code give me only variables and I need exactly table to add rows to it

  <div id="content">
        <%= render_flash_messages %>
        <%= yield %>
        <%= call_hook :view_layouts_base_content %>
        <div style="clear:both;"></div>
    </div>
</div>
</div>