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how do i do that?

all routers are slightly different, a good place to start is to follow the instructions that came with your router, in the routers settings you will be able to find out the broadcast type and MAC address control, in order to find out the MAC address of the ipod touch you do: Settings > General > About then scroll down to Wi-Fi Address
 
You should enter My Security Key, not My Password

In case your router is dir-615, you may be entering 'My Password' for password, when it should be the 'My Security Key'.
 
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