Good Night, and the process quite easy, in your domain settings you have to put your dns ips.
once this is done and so change the path in iis
1 - Go to Control Panel - Administrative Tools - IIS.
2 - Right click on Default Website or the name of the directory in which the information of your website reside.
3 - Click on Properties and go to the Documents tab.
4 - Add the desired homepage or a standard move to the top of the list. Your page should be on top of the list to be the homepage.
5 - Click Apply and OK
6 - Check your site to see if the correct page is displayed. If not, make sure you typed the name correctly on the homepage nomedapágina.extensão format. For example, one of the pages is index.aspx patterns.
I hope I have help.