In all these cases contact your school's /programme's student services. Look for programme's Into pages for contact information: https://into.aalto.fi/display/en/Homepage
No, it doesn’t. You must unfortunately create your study plan in Sisu separately.
It is a function where you can suggest changes to your study plan (e.g. if you have received an exemption). Changes always require an approval.
The Free edit mode can be found in the study plan's selection assistant. The selection assistant wil appear when you click the different headers of your study plan. Free edit mode can be found at every hierarchy level of the study plan.
See instructions: Applying for approval and Free edit mode