That's okay. Unless you are a sysop, you will never get it moved.
Information on this tag is found here with examples of how to set the children for the tag. One of those examples is as follows:
<?php wp_list_cats('sort_column=id&child_of=8'); ?>
Which sets the list to sort by ID and show only the children of category 8. If you do not want to show the children at all:
<?php wp_list_cats('sort_column=id&children=0'); ?>
If this is not working, check that you have put a ZERO and not an OH in the code, since this is actually a common boo boo. If this is close to what you used, then try retyping it and make sure you Refresh your screen completely to see the change take affect, if it does. If it doesn't, come on back and we'll take a better look.