URL LINK HELP!!

hi guys how can change this link <a href="<?php echo base_url(); ?>index.php?admin/student_add"> to this <a href="<?php echo base_url(); ?>index.php?admin/add_citizen">?? 

Im currently working on an existing codeigniter php file that my client gave me..my main problem is i don't have the knowledge to rearrange the url links he left on the existing project.

I already add a screenshok of my error

PLEASE HELP ME GUYS!! ASAP!!

THANK YOU IN ADVANCE GUYS

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Which version of CodeIgniter?
If it's 3.x, make sure you have at least a controller called "Admin.php", with a method (public function) named "add_citizen".
Never use the format from your example within CodeIgniter.
Autoload the url helper.
Apply hyperlinks like this:

PHP Code:

<?php echo anchor('admin/add_citizen');?>

There is no need to include the base_url() or index.php.