Hi @Elisa_Meyer,
Welcome to Airtable Community! :slightly_smiling_face:
When using the Checkbox field in Airtable, it expects a 1 or a 0, how does the data come from Process Street?
About the Record and Field part, you need to choose a record to update (or create) in Airtable before moving to the next step (which is putting the checkbox in its relevant column). If the data already exists in Airtable, then you can use the Find Record on Zapier to find the record that you want to update then add the info you need.
If you have more questions or info you wanna share, fee free to do so.
If this helps you solve your issue, please mark it as Solution so others can see it.
BR,
Mo