You can use your own domain by redirecting your A records to our IP address:
PS: make sure that you redirect the www A records as well!
There are two options to do that:
a) Email your previous DNS provider and ask them to redirect all A records to the mentioned IP address.
b) This option depends largely on who is your hosting provider. Log into your control panel, find the DNS settings and redirect all A records to the mentioned IP address. After that is done, your website should be live in a couple of minutes. With some providers it may take up to a day.