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Refer to https://support.smartbear.com/testcomplete/docs/app-objects/specific-tasks/standard/menu/selecting-items.html and try with the example code,
obj.MainMenu.Click("Platform|Select Browser|Chrome");
Where obj should be the menu object of your application.
Also you might need to enable MSAA, https://support.smartbear.com/testcomplete/docs/reference/test-objects/controls/desktop/msaa/index.html and https://support.smartbear.com/testcomplete/docs/testing-with/object-identification/msaa/index.html