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To change your wireless network username and password, follow these steps:
First, you must log in to your router page by typing the IP address of the router in the browser where the address is at the top. Most routers are 192.168.1.1
Or turn the router from the back to find its IP in the white paper affixed to the router from the back
After entering the page as picture

Place the username admin and password admin, as shown in the following image.

Second: After entering the router  you change the password as shown to you in the following picture
1- Press Wireless
2-Wireless Security
3-Select the password encryption type
4- Type the new password you want
5- Click Save, your settings are saved

Fourth: After you have changed your password, restart the router and your password has changed
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Best Regards,
Eng. Ahmed Qeshta