My Passport Essential reset

WD External Drives WD Portable Drives
7

This doesnt help me at all. I need to know where the reset feature is my WD doesnt ask for a password and I have downloaded the trial of Dmailer or the software that comes with it. However, it doesnt help me at all except to sync my programs to it.  I am so lost I cant delete a file from this thing and now way to reset it.  what do i do now