First, you need to enable "Remember passwords..." in Firefox options. You may also want to enable "Use a master password" which will use Firefox's built-in encryption. Personally, I don't do so as I'm already using a much stronger encryption to protect the browser password database.
You don't really need to configure anything in secure login. Once you've let Firefox remember the password for a particular website or router, then just click the "key" icon in the future, and it will log you in. If you don't see the key icon, then right-click in an empty area next to a tab, and click customize. Drag the key icon where you want.
