Thinglink can be used by students who are under the age of 13 and or do not have email addresses. To enable your students who are under 13 and or do not have email addresses you should register as a teacher on Thinglink Edu. As registered teacher on Thinglink Edu you can create and manage student accounts. In the screenshots in the slides below will walk you through the process of creating Thinglink accounts for your students.
Via Jim Lerman