"This setting only applies to a monthly subscription."

Where: student profile: the student's own number in Edit, or the This month row, on a class card.

Why: the number of attendances per month and a month's adjustment only apply to a monthly subscription. A card has a number of classes set at purchase.

What to do: to give more classes on a used-up or nearly used-up card, the owner uses Renew the card: a new card of the same type starts today and takes over the extra attendances.