I have an issue with my code this piece of code is for paypal payment i’d like to add or hard code a input or select box to my check box tag so it can calculate the quantity
Please help 
Thanks!
<?php
global $wpdb, $paypali_membership_vars, $posted;
?>
<div id="paypali_membership_form">
<?php
if (isset($errors) && sizeof($errors)>0 && $errors->get_error_code()) :
echo '<ul class="errors">';
foreach ($errors->errors as $error) {
echo '<li>'.$error[0].'</li>';
}
echo '</ul>';
endif;
?>
<form id="paypali_membership_form" method="post" action="<?php
global $post;
if (is_single() || is_page()) :
echo get_permalink($post->ID);
else :
$pageURL = 'http';
if ($_SERVER["HTTPS"] == "on") $pageURL .= "s";
$pageURL .= "://";
if ($_SERVER["SERVER_PORT"] != "80") $pageURL .= $_SERVER["SERVER_NAME"].":".$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];
else $pageURL .= $_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"];
echo $pageURL;
endif;
?>" name="membershipform">
<?php if (!is_user_logged_in()) : ?>
<fieldset>
<legend>
<?php _e('Please fill in the following form to subscribe','paypali'); ?>
</legend>
<div>
<label for="username"><span class="required">*</span>
<?php _e('Username','paypali'); ?>
</label>
<input type="text" id="username" name="username" class="text" value="<?php if (isset($posted['username'])) echo $posted['username']; ?>" />
</div>
<div>
<label for="firstname"><span class="required">*</span>
<?php _e('Firstname','paypali'); ?>
</label>
<input type="text" id="firstname" name="firstname" class="text" value="<?php if (isset($posted['firstname'])) echo $posted['firstname']; ?>" />
</div>
<div>
<label for="username"><span class="required">*</span>
<?php _e('Lastname','paypali'); ?>
</label>
<input type="text" id="lastname" name="lastname" class="text" value="<?php if (isset($posted['lastname'])) echo $posted['lastname']; ?>" />
</div>
<div>
<label for="email"><span class="required">*</span>
<?php _e('Email','paypali'); ?>
</label>
<input type="text" id="email" name="email" class="text" value="<?php if (isset($posted['email'])) echo $posted['email']; ?>" />
</div>
<div>
<label for="password"><span class="required">*</span>
<?php _e('Password','paypali'); ?>
</label>
<input type="password" id="password" name="password" class="text input-short" value="<?php if (isset($posted['password'])) echo $posted['password']; ?>" placeholder="<?php _e('Enter password','paypali'); ?>" />
<input type="password" id="password2" name="password2" class="text input-short" value="<?php if (isset($posted['password2'])) echo $posted['password2']; ?>" placeholder="<?php _e('Enter again','paypali'); ?>" />
</div>
<?php endif; ?>
<fieldset>
<legend>
<?php _e('Choose a Membership Pack','paypali'); ?>
</legend>
<?php
$free = false;
$sql_packs = sprintf("SELECT * FROM %s ORDER BY id;",
$wpdb->escape( $paypali_membership_vars['membership_database'] ));
$packs = $wpdb->get_results($sql_packs);
if (!empty($packs)) :
$alt = -1;
foreach ( $packs as $pack ) :
?>
<p class="radio <?php if ($alt==1) echo 'alt'; ?>">
<input type="text" width="10" name="pack[]" class="radio" id="pack_<?php echo $pack->ID; ?>" value="<?php echo $pack->ID; ?>" <?php if (isset($posted['pack']) && $posted['pack']==$pack->ID) ?> />
<label for="pack_<?php echo $pack->ID; ?>" class="radio">
<?php
echo $pack->membership_name.' – <strong>';
if ($pack->membership_price>0) :
echo paypali_currency_wrap($pack->membership_price);
else :
echo __('Free', 'paypali');
$free = true;
endif;
echo '</strong>';
if ($pack->membership_desc) :
echo '<small>'.$pack->membership_desc.'</small>';
endif;
?>
</label>
</p>
<?php
$alt = $alt*-1;
endforeach;
endif;
?>
<p class="checkbox">
<input type="checkbox" name="auto_renew" id="auto_renew" <?php if (isset($posted['auto_renew']) && $posted['auto_renew']) echo 'checked="checked"'; ?> />
<label for="auto_renew">
<?php _e('Automatically renew?', 'paypali'); ?>
</label>
</p>
</fieldset>
<div>
<input type="submit" name="membershipform" class="submit" value="<?php _e('Subscribe →', 'paypali'); ?>" />
</div>
<?php if (!is_user_logged_in()) : ?>
</fieldset>
<?php endif; ?>
</form>
</div>