Communication between students and teachers …
Communication between students and teachers is made via Fronter, the virtual classroom at University of Oslo. Keep in mind that e-mails sent in Fronter will be directed only to the student e-mail accounts and not to your external email adresses.
Fronter login: https://fronter.com/uio/
In addition, you should also check the course page regularly for other information (f.ex time and place, syllabus), not only Fronter.