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the right bottom of the page :
User security settings can be done on desktop-client.
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- Properties – changes the properties of a user or group. (name , password , etc.)
The project administrator is usually only one person. There cannot be more than one administrator for one project. After opening the project for the first time, the current user, who created, is the just one
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Project -> Properties -> Security -> Project Administrator field by clicking Change button . And at the opening window you can select the administrator user from the users list .
Project Administrator is the only one privileged to browse in the security settings and to apply changes there.
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