The Wisconsin Correctional Association (WCA) is a state chapter of the American Correctional Association (ACA). When you join the Wisconsin Correctional Association, you are also joining the national American Correctional Association where you'll have dual membership in both.

Click the ACA icon below. Select the MEMBERSHIP tile pull-down on the wide blue band. It will turn red as it presents you with membership options.
Select “Join ACA” on the pull-down menu. Sign up for a NEW membership by clicking the big blue tile near the bottom of the screen,
“Click here to join ACA online.” You want to select Professional I, which for 1 year is $35.