Easiest and fastest way is, when making a topic or posting a reply, is to hit the "Instert/Embed Embedded Media" button, which is the one that looks like a film strip. Keep it at Flash, but paste the URL into the URL field and it will/should automatically size it for ya. If it doesn't, you can also change the dimensions. When you're ready, press "Instert" and it will put it in your post