If you give us more details about which router you have we can give more precise instructions, but basically you want to set up an encrypted connection. You can (and should) change the default router password, but this is separate from encryption.
The general procedure is:
- Log into your router
This is done with your web browser, and I would suggest using your desktop computer if it is using a wired connection to your router.
The address will probably be something like http://192.168.1.1 or http://192.168.0.1 (depends on the brand of router). - Find the "Wireless" settings
- Turn on WPA or WPA2 encryption
WPA2 is slightly more secure, but it probably doesn't really matter. Do not use WEP. - Pick a complex passphrase
Do not use simple words, but a mix of letters, numbers, punctuation. AND WRITE IT DOWN!!! - Find and change default router password
Again, do not use a simple word, but a random mix of letters and numbers. Write this down, too!
Now, go to your laptop
- "Look for wireless networks" or "Site Survey" or whatever it is called on your computer.
- Try to Connect to your network
- When prompted, enter the encryption passphrase that you wrote down earlier
This is NOT the router password, but the complex passphrase from above.
You should be done! No more neighbors using your WiFi.
Also, please note that you do not need to enter a password every time you use the internet. This was a misconception. It is actually easier than you thought!
Hope this helps,
WallyH