Instructions
Download DesignByMe by visiting the official link, http://designbyme.lego.com/en-us/default.aspx, and clicking "Download Now."
Open the DesignByMe file on your computer. Read the directions and choose to "Install" the program.
Open DesignByMe by double-clicking the desktop icon.
Build robotic-looking legs. Mechas usually have long, slender legs that are designed for speed and mobility. Do this by connecting blocks in the center of DesignByMe's screen.
Build a slender body on top of the legs. Build arms that come off each side of the body and a head on top.
Click the "Upload" button to send the design to LEGO. Click "Check Price" to receive a price on how much it would cost to build the mecha with real LEGO parts. If you wish, you can buy the LEGO parts in this screen.