Every Linksys router comes with straightforward setup methods. Follow this Linksys EA6400 manual to set up your router. Open a web browser and in the address bar, type the IP address, i.e., 192.168.1.1, and press "Enter." Now, use the default credentials to log in to the web portal. Then, select the Wireless tab, and then click on the "Wireless Settings" button. Here, specify a network name and password for your router's network. You can use WPA2-PSK in the encryption type menu. If using a dual-band network router, specify the SSID and password for the second network band. On the next screen, specify the admin login details. You can change the default login credentials if you want and click on the "Save" button.
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setup linksys e2500