It can take up to 24-48 for the entire World Wide Web to recognize your new domain name (this process is called domain propagation - and is a process which takes time for all newly registered domains and is not controlled by us).
Any time a
new domain, or "web address" is created, it takes awhile for it to
"propagate" to different servers (computers) scattered over the globe.
In the meantime, a temporary address (by IP address) is given to you so you can upload
your web files.