I would normally delete this. But the question is not that bad, and you are not using an actual page, but a hypothetical URL, which is good. Nor is your English that bad.
Best solution: Lean SQL and SQL injection and perhaps some sort of web oriented language like PHP and you will understand this easily. However I do understand that you might not want to learn all of this just to do this little injection. Or maybe you do, in which case great!
Asap solution (booooo!): Check out sqlmap (
http://sqlmap.org/). Its a automated SQL injection tool that will do all the work for you. I don't normally advice people to use tools without knowing the workings behind it, but oh well.