To add users to the team of a project, select "Project management" from main menu, click on the project name, choose "Add new members" from the left hand side menu.
The following "Search" window will appear:
To narrow the search type the name of the sought user in the "Search" field and press "Search". In case nothing is typed in, all the users who are eligible as project members will be listed.
Once the requested users have been found, to add them, check the boxes next to their names and click on the "Add users to the team" link. The selected users will then be added and listed in the project team.