At class time, log on to italki and click on the big red “enter classroom” button. Then give permission to use your camera and microphone. Supported browsers include IE, Chrome, and Mozilla Firefox. I strongly recommend that you try the classroom a few hours before class time, so that you know everything is working. The classroom will be available 24 hours before the class, so you can test it out.

到上课的时间italki会提醒你上课，按提示操作就好了。

谢谢thank you

Sometimes there can be lag on the Italki classroom, you can also try asking your teacher to use Skype instead.

Hope this helps :)