In the Menu bar, click the Tools menu, and then click Options.
In the opened window choose the Expert Advisors tab, select Allow live trading and Allow DLL imports check boxes and press OK.
To activate the Expert Advisor in the Navigator window, click Expert Advisors. Installed EA should be seen in the list. Double-click on OneClickTradingLevel2 or simply drag and drop it onto the chart. Click OK.
If the EA is activated successfully, a smiley will be seen in the right top corner of the chart.