Tip - How do I secure my wireless router?

  I have a WAG54G and have forgotten how to secure it to prevent third parties gaining internet access via my router.. I attempted to put the 192.168.1.1 into the browser bar and connect that way, to alter the details, but was presented with an account and password box I did not have the information...
Tags: adem.smk@gmail.com kardeş wag120n friware son sürüm lazım, change, Cisco, connection, custom build firmware for wag200g, DHCP , WAG120N, WAG320N, Wi-Fi, x3500