Define URL loops by starting at the Main Menu and the line of the URL that you want to start a URL loop at.

The Add Transaction/Insert Page Break/URL Loop Dialog will appear.

Select the URL Loop Tab:

URL Loop Input Fields:

(lightbulb) Hint: User Input Fields are freely configurable load test program options,
for which you are prompted when starting the load test:
For a User Input Field to take effect, you must assign its variable.