how'd you know your neighbour is leeching off you?
Generally you need to type 192.168.1.1 into your browser's address bar to change the settings.
it's 192.168.2.1 for me
you can double check in the command prompt by typing ipconfig and look for Default Gateway (if you're on windows) or in System Peferences > Network and look at Router (if youre on mac)
from there its all about which brand of router you've got as SkyMarshall alluded to, but you can generally figure out where to change the password once you've typed the address into the address bar of your browser
that's a "Ch" pronounced as a "K"
Computer skills I should have:
Objective C, C#, Java, MEL. Python, C++, XML, JavaScript, XSLT, HTML, SQL, CSS, FXScript, Clips, SOAR, ActionScript, OpenGL, DirectX
Maya, XSI, Photoshop, AfterEffects, Motion, Illustrator, Flash, Swift3D