Select the + Add member button on the right side.
Provide the following information:
Do you want to add a user or group?
Select a user (or group if you selected group)
Project Role: Adds one of the available project roles to the user or group
Allow project Access- Yes or No
Apply to Systems-
Check the apply to all sliders to apply to all systems available.
Otherwise, check each system you want to add the user or group to with the role.
You must have the system mapped in CAM in the Administration-> External Systems panel. Otherwise a warning will appear.