Once you have chosen to start a loop and you have continued past the first pop-up window, you will come to the teacher panel. Here you will see Add + just below the headline Students. When you click Add + a new pop-up window will appear where you write the names of each student or the name of a class (if you have created classes for your school in Loops). If you write the name of a class, all the students will appear at once. If you have a new student who has not yet got a Loops account, you can invite that student via email and your student will create an account going into the loop.