How to MAP THE FORM IN THE SUB-PROCESS

Hello,

I'm in the stage of doing an instructions for Appian and I came across a stage where I have to map a form to the existing sub - process, this is the image showcased below

In my user input screen I couldn't find such page. Though if i validate i get this error "Error Evaluating UI Expression Expression evaluation error : Could not find variable 'ac!supervisorComment'" but in the instructions image pv! & ac! are defined though they are not defined in the variables, even though if I try to define it doesn't accept '!'. Can anyone please suggest.

Thank You.

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