Ok. Have you tried contacting the people who created the video.

Embedding the editor is generally very simple, however we don't have SMF RC3 installed, so we can't give specific instructions. However if you have an installation, then I can look at it through a web browser and post you suggests - perhaps through this forum - so you can install.

In general though you just need to follow the instructions on this page http://www.codecogs.com/latex/install.php

Then on the final pages, you need to add the javascript shown on this page http://www.codecogs.com/latex/htmlequations.php

When you finally find a solution, if you can post the steps you took to our forum that would be greatly appreciated.