Quick solution
Only for your store open your database find the table admin_user click on it, after opening that table click on structure on top, on bottom click on Go button that add new column for your table.
add the name Calc_Code and type varchar than save it.
Then create this file: app/code/local/Mage/Adminhtml/Block/Permissions/User/Edit/Tab/Main.php
and add this code:
<?php class Mage_Adminhtml_Block_Permissions_User_Edit_Tab_Main extends Mage_Adminhtml_Block_Widget_Form
{
protected function _prepareForm()
{
$model = Mage::registry('permissions_user');
$form = new Varien_Data_Form();
$form->setHtmlIdPrefix('user_');
$fieldset = $form->addFieldset('base_fieldset', array('legend'=>Mage::helper('adminhtml')->__('Account Information')));
if ($model->getUserId()) {
$fieldset->addField('user_id', 'hidden', array(
'name' => 'user_id',
));
} else {
if (! $model->hasData('is_active')) {
$model->setIsActive(1);
}
}
$fieldset->addField('username', 'text', array(
'name' => 'username',
'label' => Mage::helper('adminhtml')->__('User Name'),
'id' => 'username',
'title' => Mage::helper('adminhtml')->__('User Name'),
'required' => true,
));
$fieldset->addField('firstname', 'text', array(
'name' => 'firstname',
'label' => Mage::helper('adminhtml')->__('First Name'),
'id' => 'firstname',
'title' => Mage::helper('adminhtml')->__('First Name'),
'required' => true,
));
$fieldset->addField('lastname', 'text', array(
'name' => 'lastname',
'label' => Mage::helper('adminhtml')->__('Last Name'),
'id' => 'lastname',
'title' => Mage::helper('adminhtml')->__('Last Name'),
'required' => true,
));
$fieldset->addField('email', 'text', array(
'name' => 'email',
'label' => Mage::helper('adminhtml')->__('Email'),
'id' => 'customer_email',
'title' => Mage::helper('adminhtml')->__('User Email'),
'class' => 'required-entry validate-email',
'required' => true,
));
// custom field
$fieldset->addField('calc_code', 'text', array(
'name' => 'calc_code',
'label' => Mage::helper('adminhtml')->__('calc_code'),
'id' => 'calc_code',
'title' => Mage::helper('adminhtml')->__('calc_code'),
'class' => 'required-entry',
));
$fieldset->addField('current_password', 'obscure', array(
'name' => 'current_password',
'label' => Mage::helper('adminhtml')->__('Current Admin Password'),
'id' => 'current_password',
'title' => Mage::helper('adminhtml')->__('Current Admin Password'),
'class' => 'input-text',
'required' => true,
));
if ($model->getUserId()) {
$fieldset->addField('password', 'password', array(
'name' => 'new_password',
'label' => Mage::helper('adminhtml')->__('New Password'),
'id' => 'new_pass',
'title' => Mage::helper('adminhtml')->__('New Password'),
'class' => 'input-text validate-admin-password',
));
$fieldset->addField('confirmation', 'password', array(
'name' => 'password_confirmation',
'label' => Mage::helper('adminhtml')->__('Password Confirmation'),
'id' => 'confirmation',
'class' => 'input-text validate-cpassword',
));
}
else {
$fieldset->addField('password', 'password', array(
'name' => 'password',
'label' => Mage::helper('adminhtml')->__('Password'),
'id' => 'customer_pass',
'title' => Mage::helper('adminhtml')->__('Password'),
'class' => 'input-text required-entry validate-admin-password',
'required' => true,
));
$fieldset->addField('confirmation', 'password', array(
'name' => 'password_confirmation',
'label' => Mage::helper('adminhtml')->__('Password Confirmation'),
'id' => 'confirmation',
'title' => Mage::helper('adminhtml')->__('Password Confirmation'),
'class' => 'input-text required-entry validate-cpassword',
'required' => true,
));
}
if (Mage::getSingleton('admin/session')->getUser()->getId() != $model->getUserId()) {
$fieldset->addField('is_active', 'select', array(
'name' => 'is_active',
'label' => Mage::helper('adminhtml')->__('This account is'),
'id' => 'is_active',
'title' => Mage::helper('adminhtml')->__('Account Status'),
'class' => 'input-select',
'style' => 'width: 80px',
'options' => array('1' => Mage::helper('adminhtml')->__('Active'), '0' => Mage::helper('adminhtml')->__('Inactive')),
));
}
$fieldset->addField('user_roles', 'hidden', array(
'name' => 'user_roles',
'id' => '_user_roles',
));
$data = $model->getData();
unset($data['password']);
$form->setValues($data);
$this->setForm($form);
return parent::_prepareForm();
}
}
?>
after clean the cache then check