In Multi Markets Strategy, Markets is a property of type Market[] containing all the selected markets. You can access a concrete market with array index operator - Markets[0] for first selected market, Markets[1] for second etc. as you can see in the editor's sidebar.
// Write current price of the first market in the list of selected markets to the logsLog("Current price of "+Markets[0].Asset+" on "+Markets[0].Exchange+": "+Markets[0].CurrentPrice);// Write current price of the second market in the list of selected markets to the logsLog("Current price of "+Markets[1].Asset+" on "+Markets[1].Exchange+": "+Markets[1].CurrentPrice);