admin should have sufficient balance before adding balance to other user.
First add balance to admin yourself.

<?php

$req_point=5; //This is the required point the user about to spend.

$dispatcher =& JDispatcher::getInstance();
$sp=$dispatcher->trigger('getProfilePoint', array($user->username));
if($sp[0]==-1)
$sp[0]=0;
echo "<br>".JText::_('PROFILE_BALANCE')."= ".$sp[0]." ".JText::_('PROFILE_POINT');
echo "<br>".JText::_('PROFILE_REQ')."= ".$req_point." ".JText::_('PROFILE_POINT');

if($req_point>$sp[0])
{

JError::raiseNotice( 100, JText::_('NO_FUND') );

}
else
{
  // Have sufficient fund.
}

?>