Unable to click start lab button after click on start lab button nothing is opening
Hi. Please follow the instructions on the Vocareum page (i.e. the page that opens after clicking Launch Lab in Coursera). That will show what to expect after clicking the Start Lab button. You can also refer to the Course FAQ for other common issues. You might find point #4 useful. If your problem is not covered by any of these, please post a screenshot of what you see (along with any error messages if any) so we can investigate. Thanks.