Sometimes it happens that you uploaded your web site to your server but it still getting the default page that was assigned by the hosting company. To achieve your actual index page you have to change the nameserver for that domain if you have bought the domain from a company and hosting to other company.
Anyway, if your domain company and hosting company is same then there is no need to change the nameserver.
It also sometimes happen that you will see still the domain page cause nameserver propagated properly.