Add the My account element to the header, for example https://gyazo.com/35c744698e495c848547551108be1cb2 to show it in the header and then add the custom SVG if you want to use the custom icon for this. Or if you want to add the custom icon for the menu item My account go to Appearance > Menus > and add the custom icon http://prntscr.com/utj3kf
