Expungement is not available but sealing of your arrest record is available. A Petition to Seal is required and you fill that out and file it in the district court in the jurisdiction you were were charged. A hearing will be set and you are required to notify all agencies that may have that record on file of that hearing. Thereafter there are more notification requirements. Paperwork and some instruction on how to do this without an attorney should be available from the court clerk, or you can hire an attorney to do this for you.