The information is here: http://www.selfrepresent.mo.gov/page.jsp?id=3834
Unfortunately for you, the father MUST be involved. He will be served and given the opportunity to oppose your petition. It's up to the judge to determine if it is in the best interests of the child to allow the name change. You may wish to consult a lawyer. The fact that "daddy's in jail for beating up mom" is not necessarily justification to remove his surname from the child. You'd be best served to have someone help with the justification.

