Twenty Ten 1.3 Modify Comments Verbage

I need to know exactly how to change the words above the comments area from “Leave a Reply” (large text and Bold) to “Leave Your Comment”.

Also I want to remove the text:
You may use these HTML tags and attributes: <abbr title=””> <acronym title=””> <b>

<cite> <del datetime=""> <em> <i> <q cite=""> <strike> <strong> </strong></em>

http://wordpress.org/extend/themes/twentyten/