B.SPD refers to blower speed. The blower in your system is adjustable, so you can control its speed using the Up and Down arrows on the interface. By pressing the Up arrow, you can increase the blower speed, and by pressing the Down arrow, you can decrease it.

Ramp happens when you press the blower button twice in a row in quick succession. It means that the blower will ramp the speed up and down on its own.