I also added the code or you can follow the link below for more help.
http://pastebin.com/hKMmryE9
Magento, populating checkboxes fields on an admin edit form $form->addField('name', 'checkboxes', array('label' => 'check', 'name' => 'name[]', 'values' => array( array('value'=>'1', 'label'=>'1'), array('value'=>'2', 'label'=>'2'), array('value'=>'3', 'label'=>'3'), array('value'=>'4', 'label'=>'4'), array('value'=>'5', 'label'=>'5'), ) )); $form->addField('name', 'checkboxes', array('label' => 'check', 'name' => 'name[]', 'values' => array( array('value'=>'1', 'label'=>'1'), array('value'=>'2', 'label'=>'2'), array('value'=>'3', 'label'=>'3'), array('value'=>'4', 'label'=>'4'), array('value'=>'5', 'label'=>'5'), ), 'value' => array('1', '5'),
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