Welcome to the Make community!
From your screenshot, it looks like you were running a single module.
You cannot individually run a single module if you don’t know example values.
Try running the full scenario by clicking the “Run Once” button.
For more information, see these duplicate questions previously asked and answered by other community members:
- Missing Values While Processing Google Forms Data - #2 by Henk-Operative
- Not able to use webhook data
- Make not recognizing value of a variable
Hope this helps! Let me know if there are any further questions or issues.
— @samliew
P.S.: Investing some effort into the Make Academy will save you lots of time and frustration using Make.