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Thats for the member tutorials area, not the forums area...In the youtube link, copy all the characters after the "=" sign and put them between [youtube]{/youtube]
-EDIT-ermm... why isnt it working...
<p><title>Line follower, obstacle avoider, photovore and photophobe in 40$</title><!--break--></p><h1>Overview</h1><p> </p><p align="center"><img src="http://i305.photobucket.com/albums/nn236/pratheekn/IMG_2639.jpg" width="328" height="218" /> </p><p align="center"> </p><p><br />This tutorial details the construction of a simple and low cost robot. The robot is mainly a line follower but can also be used as a photovore, a photophobe, and obstacle avoider!And all this for less than 40$. The best part is that the robot does not use any microcontroller, which means you need no expensive programmer or even a computer to program your robot. This tutorial is mainly aimed at beginners, hence I have tried to keep the robot as simple and cheap as possible. With only a few parts you can get this robot up and going.Here is a video of the robot following black line.</p><p> </p><center><object height="350" width="425"><param name="movie" value="http://www.youtube.com/v/Wn-reuG7Irs" /> <embed src="http://www.youtube.com/v/Wn-reuG7Irs" type="application/x-shockwave-flash" height="350" width="425"></embed> </object></center><h3>Specifications and Features </h3><p>• The sensor used are four LDRs and LEDs.<br />• The steering method used here is differential drive.<br />• The actuators used are two 100 rpm DC motors.<br />• One 9V battery provides power to the robot.<br />• The robot can follow a dark line on a light surface or a light line on a dark surface. <br />• A LED is switched on when the robot is on the line (this makes things easier during debugging).<br />• It can also be used as a photovore, photophobe, and obstacle avoider.</p>
Once you click update the html editor doesnt disappear - it does embed the video into the normal editor but when you click to update the page it just disappears again.