Replacing the Default webpage

Sorry if this is a simple question, i just got a WL700gE router, i like its functionality and most of it actually meets my needs out of the box. The only thing i actually dont like (ditest if im honest) is the webpage on it. I want to know the easiest way to replace this website with just my own HTML (to keep it simple). I tried just streight replacing the index page but didnt get anywhere.
Im pretty sure this isnt the first time this question has been asked so any help at pointing me in the right direction would be appreciated.