as i know there is a different between subdomain and sub folder (please correct if i am wrong). you can create sub folder manually using FTP but to create a subdomain you have to do it in control panel.
in this case we are talking about addon domain
mercadolivre1.info.
For this
www.shop.mercadolivre1.info ,
shop is subdomain of addon domain
mercadolivre1.info and
shop folder has to be created as sub domain in control panel. but
shop is not a sub folder of addon domain
mercadolivre1.info but will be a sub folder of your main domain (
www.myvt.info)
and because of
mercadolivre1.info is an addon domain,when you create a sub domain in control panel,
shop folder will be automatically created in your main domain directory (public_html) and not in addon domain directory(public_html/
mercadolivre1).
So when you publish your index page for the
shop, you have to publish to
public_html/shop and not to
public_html/mercadolivre1/shop.
and
shop can be loaded in 2 different name:
www.shop.mercadolivre1.info or
www.myvt.info/shop