How to get Domain Name
 

How to get Domain Name?

first choose a hosting provider company then go to selected hosting company site now you can see the search box enter the domain name what you want to choose check its a available or not, if its available you can book your domain select a your domain plan and cost

Once you purchase a domain name you can't really change it. But you can always purchase a new domain and set your site to redirect from old one to new one.