How to merge accounts

I dont know how to do what I am wanting to do the easiest way.

I just bought a Macbook last night. And I just learned found Migration Assistant by accident. Holy cow! I've been a mac user for 6 years how did I not know about this thing?

Well it saved me a bazillion dollars in burned cds.

The problem is it made a new account on my Macbook representing my old computer with the files on it.

I want the files on my main Macbook account. Then I want to delete this second account it made. How do I go about this? hmmm?

Thanks.