Change the world the client connects to

Right click on the RuneScape client icon on your desktop

2

Select "Properties" and look for the "Web Document" tab.

3

In this tab, you'll see a "URL" box, containing the line;

 4

Change the 'www' to 'world1' (replacing 1 with your desired world). The line should now look like;

 5

Select 'OK', and reopen the client using the desktop shortcut.

Head to start and search: 
%USERPROFILE%\jagexcache\jagexlauncher\oldschool

2

Open the file called "oldschool.prm" in Notepad

3

Look for the the line that says:

Dcom.jagex.config=[http://oldschool.runescape.com/k=3/l=$(Language:1)/jav_config.ws

 4

Change the line to:

Replace ## with the world number you'd like to connect to. (e.g. oldschool6)

 5

Save and close notepad editor.