Where do I plug this in?

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That is a "standard" 3-pin fan connector. You can plug it into ANY 3-pin or 4-pin fan port (these are male, with pins sticking up, labelled SYS_FANn) on your mobo. The connectors will fit - they are designed that way - if you just ensure that the tongue on the mobo port lines up with the groove on the side of the fan connector. HOWEVER there is an issue to consider. The posts above say all your SYS_FAN ports are of the 4-pin type. Normally that means that they operate only in PWM Mode. Any 3-pin fan connected to that port type cannot be controlled by the mobo, so it will get power but ONLY run at full speed all the time. If that does not suit you, I suggest three alternatives.

1. Check in BIOS Setup and your mobo manual (their website...
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that is a normal 3-pin fan connector that plugs into 1 of the many connectors found on the board.
since you're mounting this fan in the rear of the case, then you could use the connector that is right next to the first pci-e x1 slot, which itself is to the left of the asus name.
 
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The answer is simple if your connector is 4 pin use 4 pin fan connector(you dont need manual for this that is not that hard there is still labels next to each port for what should be use) on the MB. If it is 3 pin use the 3 pin connector(there is a way to connect the 3pin to 4 pin but if dont know what are you doing better dont try it). If for some reason you dont have free fan connector on you MB there is some adapters you could buy and get power from PCU for your fan(s).
 
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If the OP is asking where to connect his fan, then he needs his manual. Just so you know, all the fan connectors on his motherboard are 4 pin, there are no three pins.

Before giving advice, you may want to check the facts before posting.
 
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That is a "standard" 3-pin fan connector. You can plug it into ANY 3-pin or 4-pin fan port (these are male, with pins sticking up, labelled SYS_FANn) on your mobo. The connectors will fit - they are designed that way - if you just ensure that the tongue on the mobo port lines up with the groove on the side of the fan connector. HOWEVER there is an issue to consider. The posts above say all your SYS_FAN ports are of the 4-pin type. Normally that means that they operate only in PWM Mode. Any 3-pin fan connected to that port type cannot be controlled by the mobo, so it will get power but ONLY run at full speed all the time. If that does not suit you, I suggest three alternatives.

1. Check in BIOS Setup and your mobo manual (their website is down right now, so I can't) for configuration options of the SYS_FAN ports. SOME mobos allow you to set the port operation mode to either PWM Mode or Voltage Control Mode (aka analog mode). IF you have that option choose Voltage Control Mode for the particular SYS_FAN port you are using - that is what your 3-pin fan would need to be under mobo control.
2. Consider replacing that fan with a 4-pin PWM fan that CAN be controlled by your mobo's SYS_FAN port.
3. Use an adapter to connect this fan directly to a power output connector from the PSU (typically a 4-pin Molex, maybe a SATa power output). It will still run always at full speed this way, AND its speed will NOT be displayed by your system, but it avoids using a mobo port IF you want to save one for another fan.

Option 1 is cheapest but requires a feature your mobo may not have built in. Option 2 will always work but costs you some money.
 
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