An idea is the point of departure for a thesis. There are two kinds of ideas:
Ideas can only be selected or created when there is an active application period. No more than one idea (regardless of type) can be selected or created for each application period.
After you have selected a supervisor idea or created a student idea, wait for information from the allocated supervisor. You will find out who is your supervisor at latest on the course start date.
It is extremely important that you make sure to fulfill all requirements before the course start date to prevent problems arising from not having done so.
On or sometime soon after the course start date, you will have a first meeting with your supervisor. You will get details about the first meeting by clicking the idea when the supervisor has entered them.