How can I get an injunction on the uncle of my daughter who has sexually molested her?

An "injunction" is a civil matter in which you ask the court "to do something" to prevent something from happening. In the case of molestation, this is typically a criminal matter in which you first need to contact the police to make a report. From there, your local prosecutor or District Attorney will determine if any criminal charges will be filed against the uncle who is allegedly molesting your daughter.