Let's talk baby steps first. Do you have a wireless router or some other device that lets you connect to the internet wirelessly? Do you have access to change settings on said device? Are you using a DS/DSL or one of the DSi models?
I know that it looks like I'm addressing you like you are a 5 year old, but when you question some of the basic requirements needed to get online with the DS, I want be talking to you at your level. It's easier to start dumb and work our way to smart than the other way sometimes.