I'll explain the pictures to you...
The first one you should look at is:
This is the first screen. It's a fresh install, and although it's 9.0 the rules haven't changed much, everything should still apply.
The second one:
This is showing you where to go to in the Mandrake Control Center (which is the eighth icon over on the taskbar in my screenshot)
Click the connection icon and...
Should appear. At this point choose the wizard button at the bottom, you should now see:
Click the Auto Detection square, and then next, now we see:
Here you will click on ADSL connection, and then click next:
Make sure you've got the "use bootp/dhcp" checked. This configures everything for you. Now click next:
Do not enter anything for your hostname, just click next:
You need a restart, this will let you get on the internet without restarting the entire computer and just the network:
Click finish of course
The blackbox should actually contain a real IP, and have DHCP where mine shows lan. The important part is "connected" should be what you have showing.
And then in the white box below that, your IP address should again be a real IP (mine is fake) and your Protocol should say "dynamic" or "DHCP"
Ultimately, it should say "up".
If all this is working, click apply, and then OK.
Open up a browser and see if it works, if not, post back.