A minor is a customer who is under age, and who must be accompanied by a parent or legal guardian. In SportKeeper, a minor is not considered a member or customer. That is to say, a minor does not have charges or memberships, and as such they will not appear in the main customer list.
A customers minors are found under the customer profile.
As far as waivers are concerned, the parent or legal guardian will sign the minor waiver on behalf of the minor.
Typically, a customer will fill out the waiver on the kiosk. If you have added a minor waiver, then the customer will be able to add the minors to the waiver.