Line 8a on Form 7203 will not allow me to add a number - it is shaded in blue and not yellow - can anyone aid?

These numbers pass through directly from the K-1 and the prior year.  In order to change those numbers you need to change the K-1 input.

@emma60608 

Thanks! It does not populate itself from the K1. I realised that if I enter it into the "workbook" at the top of the form, then it populates down below.