What do yu mean by register in your name? If the iPod still has the previous owners information, then connect the iPod to your computer and restore to factory defaults/new iPod. See:
iTunes: Backing up, updating, and restoring your iPhone, iPad, or iPod touch software
To set upon the iPod a mail account yur already have go to Settng>Mail, Calender and Cantact and tap on Add Account. The enter the appropriate information for you particular provider. You can go to yur provider's support site to find the settings. You may have to use the iPhone settings since many do not list a seperate iPod settings.