Unfortunately, according to the envato rules it is not included in the free support .
What’s not included in item support
Item customization
Item support does not include services to modify or extend the item beyond the original features, style and functionality described on the item page. For customization services that will help you tailor the item to your specific requirements, we recommend contacting the author to see if they privately offer paid customisation services or checking out the great service providers on Envato Studio.
http://themeforest.net/page/item_support_policy
Thanks