Ok, the easiest way to do this is to go to the player menu (global players link from the menu) and type in the user name required. This will ensure you get redirected to a URL which will provide the player's details. The important things in the URL are after the "?". You will need to copy the "p=3965" and the "a=player" and possibly the "g=4" (although this is the default). Between these you'll need a "&" character. So, you'll get a URL like:
From the looks of it the "g=4" part will just mean the "Homelands" level set will be placed first in the score profile.
Enjoy the new levels!