It's not the linksys website, what you're doing is logging into the Linksys device. It has software inside it which has settings options. Open your browser & in the address bar, type in 192.168.1.1 & that will open up your Linksys router. Yes you may need an admin password. You should already know what that is.

Your model is the same as the person in the link I gave & the same as the example given by Grandpa.