Make sure Demo account has sufficient historical data and lot size is not too large for demo account size. If lot size is too large for Free margin it will not take any trades. Look at Experts tab at bottom of chart window to make sure there are no errors. Make sure the EA is active by looking at the icon in the upper right corner of chart window. Make sure demo account broker allows trading with EA’s. Make sure EA is attached to the right chart and period. Make sure AutoTrade or AlgoTrade button is active. Make sure you installed EA after pressing AutoTrade or AlgoTrade button. If all these things are correct the EA should start trading.