Norstat Panel states on their website:
"Membership with Norstatpanel is by invitation only or as part of a special promotion. For reasons of research methodology, we cannot offer membership directly to those interested in participating in Norstatpanel."
This means you can't register to sign up directly on their website. However, there is an alternative way to join Norstat Panel, though it's not guaranteed. Occasionally, an indirect sign-up option becomes available, which I’ll explain below.