After completing probation, how does one use their judicial diversion?

I was arrested and convicted on drug charges in 2012. I was given two years probation. I was given a diversion that I assumed would be activated once I completed my probation agreement. I had a house fire years ago and lost all the paperwork I had on my case. I do still owe on court costs. What is my next step in using my diversion to get this felon off my record. I desperately want to be a functioning citizen in the work force. Thank you for any information you’re able to give me.