Invite allows you to invite project collaborators so you may communicate with each other through the system.
You will invite the others by clicking the drop down and selecting the name(s) of those you would like to work with you on building the request. You may give them view access (where they can view the request and share their comments) or edit access (where they can edit the request, update and make changes). You will click the green Invite button and they will receive an automated email notification letting them know they have been invited to the project. When you are done, you can click the Done button.