Dirt devil en vision

\015 I have a dirt devil upright 12 amp en vision I lost my manual so don’t know how to get the power brush upholstery attachment to work,also the side attachments don’t seem to have enough suction to clean edges. It works great just on my rug but not able to get attachments to suction properly\015 – Dirt Devil CE5500 Floor Keeper Upright Wet/Dry Vacuum