I have already bought a new domain name but I can not access it?

Once you purchase a new domain name from Siteground it has to be configured on your account in order to use it. You have two options:

to park it over your primary domain so that it opens your main site. Follow this link for more information;
to create a new site with your new domain. For this purpose you will have to configure the domain name as an addon one. You can check this tutorial on Addon Domains and how to manage them.

destination source:https://www.siteground.com/kb/i_have_already_bought_a_new_domain_name_but_i_can_not_acces/