Howdy Paul
On YouTube you click the "share" just under the video you have up to watch, and down below that a little ways will be a share "code" highlighted in blue that you copy and paste onto your posting here.
As for how your engine is running, I'd say it seems to be running very consistently and strong, all good things. Two challenges that I like to put to my M90 is to load it to see how it behaves, and to see if I can get it to run consistently hitting less than 60 times per minute with no load.
I'd say from what I see in your video, that yours will pass both tests just fine!