User management is accessible from the configuration menu > users
Click on the edit icon in the "Actions" column at the end of the line of the selected user.
Choose the tool to which you want to give access to the user.
Then select which project will be accessible for writing and/or reading. To do this, click on Limit acces to users.
Thus, a pop-up window appears allowing you to search for projects and assign rights.
Click on the "Save" button at the bottom of the popin to validate the rights on the projects.
When you return to the "Modify a user" page, click on the "Save the user" button at the bottom of the page to validate the global configuration of the user account.