Find this code in your theme's item .php:
<div id="contact">
<h2><?php _e("Contact seller", 'bcute') ; ?></h2>
<p class="name"><?php _e('Name', 'bcute') ?>: <?php echo osc_item_contact_name(); ?></p>
<?php if(osc_item_show_email()) { ?>
<p class="email"><?php _e('E-mail', 'bcute'); ?>: <?php echo osc_item_contact_email(); ?></p>
<?php } ?>
<?php if ( osc_user_phone() != '' ) { ?>
<p class="phone"><?php _e("Tel", 'bcute'); ?>.: <?php echo osc_user_phone() ; ?></p>
<?php } ?>
<ul id="error_list"></ul>
<?php ContactForm::js_validation(); ?>
<form action="<?php echo osc_base_url(true) ; ?>" method="post" name="contact_form" id="contact_form">
<?php osc_prepare_user_info() ; ?>
<fieldset>
<label for="yourName"><?php _e('Your name (optional)', 'bcute') ; ?>:</label> <?php ContactForm::your_name(); ?>
<label for="yourEmail"><?php _e('Your e-mail address', 'bcute') ; ?>:</label> <?php ContactForm::your_email(); ?>
<label for="phoneNumber"><?php _e('Phone number', 'bcute') ; ?>:</label> <?php ContactForm::your_phone_number(); ?>
<label for="message"><?php _e('Message', 'bcute') ; ?>:</label> <?php ContactForm::your_message(); ?>
<input type="hidden" name="action" value="contact_post" />
<input type="hidden" name="page" value="item" />
<input type="hidden" name="id" value="<?php echo osc_item_id() ; ?>" />
<?php if( osc_recaptcha_public_key() ) { ?>
<script type="text/javascript">
var RecaptchaOptions = {
theme : 'custom',
custom_theme_widget: 'recaptcha_widget'
};
</script>
<style type="text/css"> div#recaptcha_widget, div#recaptcha_image > img { width:280px; } </style>
<div id="recaptcha_widget">
<div id="recaptcha_image"><img /></div>
<span class="recaptcha_only_if_image"><?php _e('Enter the words above','bcute'); ?>:</span>
<input type="text" id="recaptcha_response_field" name="recaptcha_response_field" />
<div><a href="javascript:Recaptcha.showhelp()"><?php _e('Help', 'bcute'); ?></a></div>
</div>
<?php } ?>
<?php osc_show_recaptcha(); ?>
<button type="submit"><?php _e('Send', 'bcute') ; ?></button>
</fieldset>
</form>
</div>
<?php } else { ?>
<?php } ?>
<?php } ?>
Add this text right under the third to the last line:
Before:
<?php } else { ?>
<?php } ?>
<?php } ?>
After:
<?php } else { ?>
Login to contact seller
<?php } ?>
<?php } ?>
That text should show below the item pictures and disappear when you log in