You can use labels in a number of ways to organise your requirements:
If you want just put a marker against a requirement to revisit it, create a label as shown above.
If you have multiple teams working on a project, you might want to have a label for each team
If you have multiple technologies on your project, you might want to label each requirement accordingly
Create labels for status, such as In progress, awaiting UAT, Completed
Or you can use ScopeMaster's Kanban Board and Kanban status attributes for tracking the status of a requirement.