How to open up Fidelity Active Trader Pro Account for a contingent

Signing into Fidelity Active Trader pro requires a Fidelity account. But it seems that contingents — a type of beneficiary — of a Fidelity account are not allowed to make a separate account.

As a contingent, I am trying to open my own brokerage account not connected to the primary fidelity account; how would I go about this?