The URL is unique for every person. If the tab trick doesn't work on your computer, you can try this. Open the source code, and search* for
<AREA shape="poly" coords="188,192,188,188,192,188,236,213,236,217,232,217"
Then, after that, you'll see
HREF="/altador/..."
Copy the text in between the quotes. Make sure you don't copy the quotes themselves. Now in your address bar, type www.neopets.com and then paste the copied text right after that, so it's something like
www.neopets.com/altador/blablabla/blablabla.phtml?124124
and hit enter.
*Don't physically search, hit Ctrl+F, and then paste the code (Windows)
If you can't find the code, then tell me here, and we'll go over the last step.