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Why the hell do you ask here(a-m-v.org) how to upload on youtube??
Also your topic is in the completly wrong section here, I don't see anything here that has something to do with windows movie maker (probably you made your videos with it, but that has nothing to do with the upload)...
And I really don't know if there actually is a right section here for your topic, since your question isn't related to a-m-v.org in any way....
I suggest you to ask around on youtube how to upload there....
But...
If you want to upload your AMVs here follow this
guide