mistake on nhs bursary application

I am a dependent student. In the parents section, when asked if he had any dependent children, my dad wrote down my details again by accident.
Now, I have received an email to provide proof of the child benefits of my dad's dependent children! However, there is only me.
I think that the system now assumes there are 2 dependent children. How do I change this, as when I log in now I cannot access the parts of the form that my dad filled in.
Thank you