Questions like these you should be posting on the Moparscape site, you are most likely to get help there than you atre here.
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You download a different source from a RuneScape private Server community
you cant! its simple any world has the same exp
to change your stats on runescape all you have to do is level up.
There are 100's of Runescape private servers that work in the moparscape client. On the moparscape website they have a list of servers that are currently online. You go to one of the most used/popular servers and download it - change the servername and port on the client and you should be good to go.
There is no editor for Runescape. The only people that have the programs to edit or change Runescape is Jagex.