If you want to become a member of Tindegruppa you have to be a member of NTNUI and pay a one-time membership fee. The fee is 200 NOK for students at NTNU, or 100 NOK for exchange students. You can choose to pay here on the website by clicking on the link below, or by paying through vipps by searching for «tindegruppa», and then choose «kontigent».