How to add constraint into the Form to only assign user to edit certain area

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Hi Guys,

I have created a form. This form is initially completes by the supervisor and submits. Then it will be available to the employee to add his own comments.

Still I have not completed the form because I am unable to add constraint into the Form to only assign user to edit certain area. However I have used the horizontal line in WYSIWYG edit to split the Form but I do not know how to link it to the user.

Need your expertise knowledge support