How to enter GST remittance on self-employment or business income form?

I collected $3360 in GST, but using the quick-method I'll only be remitting $2541.  How do I fill in this form?

I'm particularly confused about the box "For each applicable remittance rate..."  Do I enter $2541 (e.g. column 3L in T2125) or do I enter $819 (e.g. column 3M in T2125).

Or am I completely misunderstanding this???