Generally for Steam-a-Seam 2 (the double sided product):
-Attach SAS2 to the fabric --just tap it a few times with the iron. Leave paper on.
-Trace the design on the paper side,
-Cut out shape.
-Position where you want on background fabric.
-When you're certain you like the positioning, press it with the iron for a permanent bond.
The first and second steps can be interchangeable.
Or are you using the one with fusible on only one side.