The number of licensed users must be the same as the number of application users of Kintone, or the order quantity must be greater than the number of application users.

The timing to change the number of licensed users varies depending on the subscribed plan.
Check when the subscription details can be changed before proceeding to STEP2.
When You Can Change Your Subscription Details

Billing will occur after the change in subscription details has been reflected.
When Changes of Subscription Details to Kintone and Billing Are Reflected

Change the Number of Licensed Users.
Changing the Number of Licensed Users

Register user information on the Kintone Users & System Administration screen.
Adding Users