Chrome: http://support.google.com/chrome/bin/answer.py?hl=es&answer=95647
Explorer: http://windows.microsoft.com/es-es/windows7/how-to-manage-cookies-in-internet-explorer-9
Firefox: http://support.mozilla.org/es/kb/habilitar-y-deshabilitar-cookies-que-los-sitios-we
Safari: http://support.apple.com/kb/ph5042