OK Then. So basically, if you wanted to make ask.com take you to google, you would first need to find out the IP address of google. This
Website is good for that. Just fill in the domain name (in this case google.com) and press "find IP address". Then, Copy the IP address it gives you (188.8.131.52).
Now, you need to open the hosts file. I used notepad. You will see load's of text at the top, telling you how to use the file. Underneath that, you will see a line that says:
All you need to do now that you have the IP address, is make a new line, and type:
Hope that's usefull to you!