Still need help on power connectors :(

Hello i don't know if im in the right section but can someone help me cause im going to pay 250 for a graphics card and don't know all about Power Connectors or another way to call it is 6-Pin external Power Connection

now please tell me if im right here You plug the 6 pin Connector into the Graphics card But What i wanna know is Where do you plug the other side?? To the GPU cause my gpu doesn't have any Plugs or anything like that on the side and also Im getting a Gtx 560 that requires 2 x 6 pin connectors atm my computer in the inside only is showing 1 of those.

and the brand im buying the graphics card off is MSI and they give you (1) 6 pin connector So i already have 1 but where do i put that extra one like How do i install it?

Also my GPU is 680watts?

And here's my System Specs:Component Details Subscore Base score
Processor Intel(R) Core(TM) i5 CPU 760 @ 2.80GHz 7.3 5.5
Determined by lowest subscore

Memory (RAM) 4.00 GB 7.5
Graphics ATI Radeon HD 5570 5.5
Gaming graphics 2539 MB Total available graphics memory 6.6
Primary hard disk 846GB Free (931GB Total) 5.9
Windows 7 Professional

System
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Manufacturer Gigabyte Technology Co., Ltd.
Model H55M-S2V
Total amount of system memory 4.00 GB RAM
System type 32-bit operating system
Number of processor cores 4
64-bit capable Yes

Storage
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Total size of hard disk(s) 931 GB
Disk partition (C  846 GB Free (931 GB Total)
Media drive (D  CD/DVD

Graphics
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Display adapter type ATI Radeon HD 5570
Total available graphics memory 2539 MB
Dedicated graphics memory 1024 MB
Dedicated system memory 0 MB
Shared system memory 1515 MB
Display adapter driver version 8.920.0.0
Primary monitor resolution 1360x768
DirectX version DirectX 10

Network
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Network Adapter Realtek PCIe GBE Family Controller

Notes
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The gaming graphics score is based on the primary graphics adapter. If this system has linked or multiple graphics adapters, some software applications may see additional performance benefits.

Help please Thank you.