Open the section and complete all bold black sections or bold red
sections of the page. After completing this step, tap “Complete” at the bottom of the page or the check mark at the right top corner and the section should go green. Do NOT use the "X" mark or "Back" button at the left top corner of the screen, that's kind of like the "Cancel" button in Windows and does not necessarily save the changes made on that page.
Note: on some specialty projects (you know who you are), photos are
required for document verification like that of low income.