Supply the name of the script to load in the dropdown list.
To use this authentication method, you first need to write (and save) an Authentication Script
Your authentication scripts should be stored under the path given above for "ZAP Settings".
e.g. If 'ZAP Settings' = "C:\Users\<USER_ID>\OWASP ZAP_D"
then the scripts should be saved under "C:\Users\<USER_ID>\OWASP ZAP_D\scripts\scripts\authentication"