Plesk - how to change domain's IP address

I am running plesk 9.2. I need to move one domain from the shared IP to dedicated IP. How do I do that? My server vendor has already allocated the IP addresses to me and I can see the unused IPs in the Ip address pool. How can I change the ip of suppose; mydomain.com from 1.2.3.4(shared) to 4.5.6.7(dedicated)? Can any body help?

This is Plesk 9.2 question, please.

I suppose its the same with the old ones although the interfaces is quite different now.

Make sure the IP is set as dedicated and not shared.
Assign/allocate the unused IP you plan to use to a user.

Go to settings > IP addresses

You should be able to set things from there.