Hey Nairalanders, today i decided to give out 2 free Brazilian IP's you can use to configure your Laptop/PC for free on my blog. And you can also get the settings on how to configure you Laptop/PC to use any IP address.
If interested, check my blog on: http://www.tecno-updates..com/2013/11/brazilian-ip-for-free.html

I hope this post is helpful

Below you'll learn how to change IP address in Firefox by using a special type of Internet server known as a proxy. Access to these server is available on both free and paid systems. I'll discuss the differences in this article as well.
STEP #1 to change IP address in Firefox
Go to your Firefox's dropdown menu for Tools -> Options
STEP #2 to change your IP address in Firefox
Click on the Advanced tab, and then on the Network tab.
In the "Connection" area, click Settings.
STEP #3
Check the box for "Manual proxy configuration".
Check the box "Use this proxy server for all protocols"
In the box "No Proxy for", enter "localhost, 127.0.0.1" so that connections within your computer don't go through the external relay.
See more details with diagrams at http://tecno-updates..com/2013/11/how-to-change-your-ip-address-with.html