Bug while doing a lesson

I can't seem to get past this , the screen has freezed, and it doesnt let me even write in the text box. It's not the first time it happens to me, and it has ruined a lesson while i was in the middle of it :(


Can someone tell me how to paste images here?

February 19, 2014


to post images

February 20, 2014

Test Hi

January 3, 2016
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