On the Requirements Page, you have a full overview of your requirements on xChange. There you can validate your current requirements and update the system in a quick fashion. Just find your outdated requirements by clicking the Validation needed section.
On the right side of every requirement, you can click the checkmark to validate or remove the requirement by clicking the Invalid button.
Validating your requirements will increase your up-to-date percentages. You find your requirement percentage on the top right corner of the page. Try to keep your percentage at 100% to improve your chances of striking new deals on xChange.
You can also add new requirements by clicking the yellow Add Requirements button and filling in your current needs.