Long story short I had to make a change with Aeroplan and they booked me on a revenue flight for a segment on SQ J from SIN-PER (which is a single segment, from stop-over to destination)

What are the rules for this and apart from crediting my miles, what else can I potentially do?

Can make changes as per usual J class tickets on SQ to move this flight to another time/day?
Would I just do this by calling SQ with the new single segment booking code?