Is there any computer online using the router.
If not then you will need to connect the computer to the router.
If yes then you can open the router set up page on that computer.
router set up page is the page where you can check all the router settings.
On this page you will get the option for wireless security settings. You can change the wireless network key. It will be better to change the wireless network name also.
Make sure that your computer will be connected to the router with the cable.
Click Here for step by step instructions
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