Users are limited to one test per order. When the test is ordered it is linked to the binx account holder which means that you can't order a test on behalf of someone else. If you are interested in ordering tests for multiple people, you will need to use a different email for each test kit. This will mean logging out of your account and then placing a new order with a different email address and the name, DOB and other personal information of the individual who the test is for.
In order to register a kit for your child without their own email address, you must use a separate email address for them that you can control. One simple way to do this is if you have a Gmail account you can use the + modifier. So if your email account is JaneDoe@gmail.com and the minor you are testing is named “Chris" then you would create the account with the email JaneDoefirstname.lastname@example.org. All notifications will still route to your Gmail account.