How to make looping

Hi,

Please allow me to ask a very simple looping question as I only found how to stop looping question instead of how to make it loop.

Attached is my .fla file. I don’t understand why it can loop at .swf but just can’t loop at .html when I publish it?

My 2nd question is, is it very hard to learn Action Script in Flash? Or for those at least have progarmming background can understand the coding?

Please advise. TQ very much!