How to fill in updated rows in Google bigQuery?

Question

Google Cloud Platform

Never worked with this service before. Created a table by importing from CSV. The table has two columns: string required URL, boolean nulable DONE. I then select from this table and export it back to Google Sheets. There I change the DONE values ​​to true. Now I would like to upload the updated data back.
How can I do this to overwrite existing values?