HMRC form, "student loans" section

I'm almost done filling my HMRC form, but there is a section I'm stuck on.

The section is "student loans" and it says,

"If you left a course of Higher Education before last 6 April and received your first Student loans instalment on or after 1 September 1998 and you have not fully repaid your Student Loan, enter X in box D. (If you are required to repay your Student Loan through your bank or building society account do not enter an X in box D.)"

What is the difference and which do I follow?

I completed my course in 2012.

Thanks.

Repaying through bank/building society would, I assume, be if you had a loan yourself, rather than through the government.

Essentially, assuming you had a student loan in the normal way, and are expecting it to be taken out of your wages, you want to put an X in box D.

Done it now. But do I have to contact student loans company to update them on my employment details?

Thanks for replying.