You will find the CLE activity number(s) in the calendar event details of the event you attended which can be found by visiting the PCBA Events Calendar page here. Simply locate the event you attended and click on it and if CLE credit is available, you will see the activity number(s) towards the bottom of the event details.
Additional CLE information and resources are available via the Iowa Judicial Branches Office of Professional Regulation. https://www.iacourtcommissions.org/