Motorola AP-51XX - Manual (Page 218)

AP-51xx Access Point Product Reference Guide 5-70
5. If the MD5 authentication method is selected, fill in the Key #1 field (Key #2 is optional).
Enter any numeric value between 0 and 256 into the MD5 ID area. Enter a string consisting
of up to 16 alphanumeric characters in the MD5 Auth Key area.
6. Click the OK button to return to the Router screen. From there, click Apply to save the
changes.