Customize Silverstripe Login Form

I have password protected my whole Silverstripe site and now I need to customize the form fields for the login screen. Where can I find where this is happening? Another problem I would have is: I want to show the custom login screen to anyone not trying to access http://example.com/admin (meaning, show the default login screen if an admin is trying 开发者_高级运维to login, else show the custom one).

I'm using the latest version of Silverstripe (2.4.5)

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might need this too in a future project, so i did some research and found these: http://tamethebackbutton.blogspot.com/2009/09/customize-your-own-silverstripe-login.html might work for you too?