VAT registration - VAT number box greyed out

Hello,

I have recently became VAT registered in the United kingdom

I'm attempting to add my details to my FBA profile, but i'm struck with this:

Note: I am currently a sole trader

I assume Citizen ID is my national insurance number

Business ID i do not have (this is only for LTD's etc)

The VAT box is greyed out, even when i add numbers and select country of The United Kingdom

Could anyone please advise what to do next? - i've heard from other threads that entering the wrong information can really create some troublesome problems!

Many thanks