The colored dot shown on the task list is a filling indicator for the additional information contained inside a task. No dot on the task list means no additional information to be filled.
Green dot: all additional information have been filled in.
Orange dot: some additional information are missing, but answering them is not mandatory. It won't prevent you from sending your flight report.
Red dot: a mandatory additional information is missing. This will prevent you from sending your flight report.
If mandatory information is missing, this message appears when you try to send your flight report:
Just fill the missing data or deactivate the question to send your flight report.