What steps do I need to take to get a misdemeanor expunged? "terroristic threat" is listed on my background.

I called the police in 08' before Molly Ellis filed a report against me in 08'. I was receiving death threats online & began getting cyber bullied by people who seemed to know me & knew what I did in the privacy of my home on every site I was on. I assumed it was people who knew me, I'd filed a sexual harassment suit against The Galt House Hotel's supervisor, Ellis 11-07. Her cousin told me she hated me through emails, I kept profile i.ds, threats in email that I no longer had access to by 4-08, my Myspace account was also deleted by someone in 5-08. I received a letter in the mail 07-2013 saying there was a warrant for my arrest and to go to the police station to talk to someone. I had a court date, Molly nor her lawyer showed up. My huge bag of evidence was not looked at.