problem with new graphic card

Stream:

bjo19

Halo3 Team
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Console: Headset:
ok, I hope someone can help me here, I got a new graphic card from someone.

It's a geforce 6200 256 MB DDR2 (yes not awesome, but its an upgrade)

before I got it we checked if it was compatibel with my motherboard, I've got a PCI-express one and if I read the installation guide it says it should work on a PCI or AGP.

So I opened my comp and I thought the white drive would be were to insert it.. but it doesn't fit..

Can someone tell me if I'm just doing it wrong or if the installation guide is just a pain in the ass and says things that aren't correct.

Been searching for an answer for hours but can't find anything