Thank you for reaching out for assistance on the PowerSchool Community!
The school district requires 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.
A commonly overlooked field is "Has your student ever attended school?". I suggest reading over the information you have entered for accuracy. It is possible that the field is only required because other information is missing.
Please let us know if you have any follow-up questions.