Why does my chart have a cross/sad face in the corner?
It seems you don’t have Expert Advisors enabled on your MT4 terminal. This can be done by simply clicking on the ‘AutoTrading’ button in the main toolbar above the chart. When the little symbol inside it turns from red to green EAs have been enabled. Alternatively you can do this by going to ‘Tools’, ‘Options’, selecting the ‘Expert Advisors’ tab and ensuring that the ‘Enable Expert Advisors’ box is ticked.
You also need to make sure that the specific EA is enabled for trading, by selecting 'Allow Live Trading' in the 'common' tab when you drag the EA to the chart.