Hi,
It is pretty easy.
Open this PHP file:
/components/com_virtuemart/views/manufacturer/tmpl/default.php
find and remove this line:
<h2>
<a title="<?php echo $manufacturer->mf_name; ?>" href="<?php echo $manufacturerURL; ?>"><?php echo $manufacturer->mf_name; ?></a>
</h2>
BUT! this is a Virtuemart Core modification, therefore it will be retrieved back to original state if you "Update" your Virtuemart. Don't forget to re-do the same modification if you ever update your Virtuemart to any newer version in the future.
To make this modification permanently, you need to use "Template Overriding". So, updating Virtuemart won't retrieve your changes.
More info about Template overriding:
docs.joomla.org/How_to_override_the_output_from_the_Joomla!_core
Regards,
Support