The single checkmark replasces the figure, the double checkmark adds an additional figure to the scene. Once you have loaded the conformer(the clothing), make sure that the clothing figure is selected, and go to the "figure" roll down menu at the top of the screen. Choose "conform to" and choose your character from the drop down list. That will conform the clothing to the figure. It won't matter if yoiur chaacter is in zero position or not. It is important to have the character loaded prior to the clothing though. I don't know why, but loading the clothing first just confuses the program.