Adding Students to an Existing Class from Admin Console
You can add students to the class you have created.
【Step 1】 Select "Classes" from the admin menu.
https://gyazo.com/a24d2d6f2b8e492ff40b9d49912dc83a
【Step 2】Choose the name of the class where you want to add students.
https://gyazo.com/c808f18e0862c424efa1813644f4950c
【Step 3】Select "Import", fill in the necessary fields in the template file, and upload.
https://gyazo.com/b8f19d4bbfbfc5eaf33b585e7e333e04
https://gyazo.com/5294118e943f46486ba4bc660c681c85
Reference
How to inform students of the class participation code and have them join the class: Class Code