The version of Internet Explorer you are using should operate italki efficiently.Look on the top icon bar and go to 'Start page' .
That should be your homepage.
You can browse "language partners" on the column on the left side of that homepage. Browse members profiles looking for native English speakers learning Chinese for mutual benefit.
Once you opened a member's profile , you can instantly chat with them by pressing on "chat now" on their profiles. That should be opening a chat box for you to interact with the other member if he/she is online and willing to respond.
Hope this works!
In case it doesn't you might have to contact an italki moderator for explanation.