I have changed to a new school. Do I have to register again?
No. If you change to a new school, you have to add this new school to your profile. This way the projects which you have started before will appear associated to the previous school, while those you begin afterwards will appear associated to the new one.
You can type in a new school profile using the tab MY SCHOOL and the option ADD A SCHOOL. It is important to mark the different schools as active or inactive (if you work at two schools you can keep more than one active).