Where can you download a stat changer for runescape 3?

There is no such thing as Runescape 3. This website is most likely a scam site bent on stealing people's passWords.

First of all, there is no Runescape 3, and if there is it's not anything to do with Jagex, it's most likely there to get you to type you Runescape 2 passWord so hackers can get to you.
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Secondly, There is no Runescape stat changer users claim there is, but then you'll be downloading a key logger of which will log you key strokes and hackers can obtain your username an passWord that way.

then
when you try to log on you cant