Only a project owner can assign people to the project. Learn more about project roles.​
1.
In the project view, click Settings, then the People tab.
The tab displays the list of current project members.
2.
In the field above the list, type the email or username of a person you want to assign to the project. Neptune identifies names and emails for people who already have an account.
3.
From the drop-down menu, select a role for the member.