Now that you know how to access Linksys router settings, the first thing you should do is change the router's password. This will prevent unauthorized users from accessing the router settings. To do so, go to the Administration tab at the top of the router settings page, and then click Router Password in the left pane of the router settings page.
If you are using a wireless Linksys router, you are also recommended to create a security key to keep neighbors and hackers from accessing the Internet using your Linksys router and network connections. To do so, click the Wireless tab at the top of the router settings page, and then click Wireless Security in the left pane of the page. In the Personal Key field, enter a password or key that you will be able to remember. It should also be one that outsiders will not easily decipher. To learn more about securing your wireless network, read WEP, WPA, and WPS - Which to Use?
You can access other router settings from the Linksys router settings page by clicking the appropriate tabs at the top of the page. Refer to your Linksys manual for more advanced setup instructions.