You're going to need to be more descriptive than that for someone to be able to assist you. Thread moved to 360 Mods Questions and Inquiries as this is a modding related question.
You'll first need a system/console which is either Jailborken/J-Tag
Most people on the site have a Jailbroken PS3, therefore most mods are made for PS3. I would suggest you getting an Jailbroken PS3. However, if you insist to have a J-Tag you can wither but one for around $200 or you could J-Tag it yourself. If your console is not J-Tag then there is no point giving you any links to threads which have mods for Xbox...
Regardless
is a youtube video on how to J-Tag your Xbox, you'll need to have someone do it for you or buy the equipment yourself