[avast! 2015] How to correct network issue

How can I correct this error (Your network router is accessible from the internet) in my router?
I can’t find any “access option” to manage…

I can enter and manage it, but what am I supposed to do?

Your router might be accessible from http://192.168.100.1/ and there should be some access options to manage.

Do you use wep password to access the router and net ?

Make sure you have the latest firmware installed and change the default username/pw on the router.

Sometimes it’s useful to cut off the electricity for a few seconds, so that the router can reset.