By ticking that box you create a screen which can capture the Account Designation details, either revocable or irrevocable- both options have descriptive text to assist you:
OR
A new Investor record should be created for the 18 year old, and a Freshdesk ticket raised, requesting that the Account in question is transferred to the New Investor Record.
The Portal has an Account Designation flag which you can use, which is on the first Account opening step:
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