Check to see that you have enabled it for live trades on the first page prior to the settings page. If you have you should get a smiling emoticon next to the EA's name.

Failing that look in the Journal and Experts tab for comment and errors. Post details of any errors and someone will help you to solve them.

Edited to add that the Expert Advisor tab at the top of the chart has to be enabled and also check that your copy of the EA has a blue hat in the navigation tab. A grey one denoted errors and will not enable properly.