Your employer will already have much of the information required because you provided it when you applied for your job. (Things like your birth date, postal address, date of commencement of employment etc).

There are, however, times when circumstances change in your job or your family situation, so you are advised to inform the Trustee yourself of those changes to make sure your account records at the fund are up to date. It is very important that you provide a list of beneficiaries in the case of your death.