Parked parked domains, aah!

I feel terrible, like everything is easy but dont.

This is my problem im moving a drupal multisite into a cpanel hosting.
The sites are something like this:

-maindomain.com (in public_html)

--seconddomain.com (inside site folder)

the domains share the database.

the main domain work correct, everything is fine, but the second domain dont appear.

I parked the second domain and put the dns to the same server names.

I read some tutorial about cpanel, parked domains and multisites, but dont work the instruction.

Im missed in configuration.