How a guardian can change corresponding address with UKBA

I have applied neutralization for my son (3 years old) but I need to change my home.

When I go to official "change of address" form at UKBA website (https://contact-ukba.homeoffice.gov.uk/view/coat.form)
there is nothing written as "for guardian" to complete this form. If I am OK to fill in the form as legal representative what information I should write in "company name".

Please guide me if there is any other way.
Thanks in advance

Just do it as if you were the applicant.

Jambo wrote:Just do it as if you were the applicant.

But when I write the date of birth of my son, it is not allowing me to proceed