Gmail is a vital website nowadays for communication purposes, this website has a very wide use around the globe, in order to sign in multiple Gmail accounts at the same time sign in to google on your system, from the top right click on your profile image or your profile initial from the menu click on add account follow the instructions appearing on the screen for any further guidance or information call the Gmail technician. Click here; http://www.gmailhelplinenumber.co.uk/