How do i file for harassment against specific police officers

You appear to be posting from in or near Whittier, CA.

You file any allegations you might have against any police officers with the Chief of the agency that employs the officers.

Usually that means you report the matter to a supervisor, who will direct you to the bureau, agency, or person within the law enforcement force who investigates abuses or improper actions of the law enforcement's sworn officers or employees.

 

If you want to make a formal complaint do so in writing. The agency likely has a specific form they want you to use.
A written complaint should be handled by internal affairs but won't necessarily result in the action you desire.
A verbal complaint in person or over the phone may never go beyond the peson you speak to.
If you think the police did something illegal you could speak with an attorney to weigh the situation and consider your options.