IzzyHelp is online service to support your visitors, more information on
IzzyHelp.com, it's available as 30-days free trial, then hosted in IzzyHelp's cloud or on your own PHP server.
Upload the IzzyHelp plugin to your blog, Activate it, then enter your
IzzyHelp.com user ID and helpdesk ID, you'll find them on IzzyHelp dashboard, under Installation tab.
1, 2, 3: You're done!