1. First we need to make an A Record. Go to your cPanel main menu and find the "simple DNS zone editor". It will look something like this
2. On the name field, put the name of the domain you want your players to use. The address is where you put your ip.
3. Click add record and you should be set to go. Please allow an hour or two for the internet to catch up and your new ip should be up and running. Note You have to put your port after the IP if you are not using the default port which is 25565.