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School districts require some fields to be completed to submit Enrollment forms. If you are attempting to complete a required field, but the field remains greyed-out, this means that the field is a Read-Only field and is intended to be completed with information from your school district's database.
I'd suggest reading over the information you have entered for correctness. It is possible the field is only required since the other information is missing. If none of these steps work, I'd recommend reaching out to the school to get the information changed within the school's system.
I have provided an article below that should help to explain the process further:
Cannot complete required fields on Enrollment Registration Form
If you have any further queries, please feel free to get back to us.