To enable Projects, you first need to ensure that the Projects functionality is turned on for your account. This is only available on Premium or Enterprise subscriptions, and can be turned On/Off in your lab's settings.
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On the Project section in the lab, there is the option to Allow users to use their own projects?. Switch the toggle to Yes, and they are able to create and use their own projects.

Once this is turned On, a user will be able to create their own project details and use it when creating a booking. To create their own Project, a user can do this on the Homepage on the left hand menu, and then on the Projects tab.
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Please note, this will only be applicable to the lab where this has setting has been turned on. Lab members can have access to multiple labs but will only be allowed to use their own project in the labs where the toggle has been switched to Yes.