Drupal-Overide-Login-Override-Registration

Overide the user login, user registration, and user password default forms created by Drupal core, or your current base theme.

NOTE: CHANGE "themename" to your reflect the name of your custom theme. ALSO, in part 2, you can edit "Custom" where you see it within parenthesis to whatever you want the final output to look like.
So if you want your login form to say "Awesome Login" then edit 

function themename_preprocess_user_login(&$vars) {
  $vars['intro_text'] = t('Custom Login');
}

to

function themename_preprocess_user_login(&$vars) {
  $vars['intro_text'] = t('Awesome Login');
}