Please check Custom Domain FAQ before reading further.
Please note this tutorial is for Namesilo users only. Namesilo is a domain name registrar like GoDaddy.
Please note you should follow this only when you are absolutely sure you want to use the top-level domain.
For example, if your domain is domain.com, and you have a blog, portfolio or some important content there, and follow this, it will erase everything. If your domain.com site is already occupied, either purchase a new domain or use the subdomain solution i.e. solution 2.
Solution 1: Using top level domain e.g. domain.com
Solution 2: Using subdomains, e.g. webinar.domain.com