Yeah its kind of hard to lure your buddies to buy a game you can't just pick up and play. Its not like and FPS or Adventure game where you can just explore and learn as you go along. The HoN community will eat you alive if you suck :D
You have to get the embeded code. Like on youtube for example, copy the embeded code. Create a new forum post and click on the "html" icon and a pop up will appear, paste the embeded code and click "update". Voila.