Similar to emails, flagged Responses help you better manage your data.
It is entirely up to you how you decide to manage your flags.
1. You can flag a Response by using Raise a Flag option in its tools area
2. Click once and you will raise a red flag
3. Click twice and you will raise a green flag
4. To remove a flag click once again
All of your flagged Responses will be available in a separate Flags tab