How Do I Connect My Existing Xbox 360 to Live Without Losing My Achievements?

I've had my Xbox 360 for a while, but not connected it to Live before. Now I've got a wireless adaptor and want to connect my console profile to Live. I've already tried setting up a Live profile online via my laptop, so I want to know if there's a way to link the two profiles rather than having to delete one and start over.

I remember when I set up the online profile there being an option to link it to my xbox, but I can't find this again and don't know whether it would even work for what I want it for. Has anybody had the same problem? Can anyone help?

Suggestion:

Put in the adapter and go to system settings –>Network and then connect to your wireless internet. Then if you press the guide button you should see something that says connect to xbox live.

And no, there is no way to merge the 2 profiles together.

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