If you disagree with a VA decision you received before February 19, 2019, you can opt for the modernized review system after receiving a VA Statement from the SOC on the case or a Supplemental Statement from the SSOC on the case.
What if I want to choose a different review option after I have submitted a form?
let me ask you, have you submitted a form expressing your desire to change your review option?
no I haven't sent it