Add a pupil. In “Students and slips”, choose “Add a student”. After the file question, enter their first name and surname: VocaDial works out their short name without changing anyone else’s, creates their code and lets you print their slip on its own. You get your file back up to date.
Remove a pupil. Tap ⋯ on their row, then “Remove from the class”: their code stops opening the class and their answers stay in the reports. Numbers never change: pupil no. 6 stays no. 6, and the printed attendance sheet remains correct. Their first name leaves your file at the next update.
Start again with a list. “Recreate the codes with a list” replaces the class codes with new ones, linked to your list: the slips have to be handed out again.