Your goal on each level is to reach the next one, by changing the current URL page to the next one.
[e.g. If the answer was "answer", you would change the URL page from "index" to "answer".]
Be wary - the answer will not always be obvious. You may need to use your intuition for certain levels.
Anyway, let's begin.
Your answer for this level alone is the word on the image. Nothing else.