Where are you typing those commands?

The file name after "if=" in the dd command is the input file that will be written to the output file "of=".

For example, if I have the file meego-handset-armv7l-n900-1.1-mmcblk0p.raw that I want to write to /dev/sda then I would do:

dd bs=4096 if=meego-handset-armv7l-n900-1.1-mmcblk0p.raw of=/dev/sda

BECAREFUL to check that what you put for the "of=" is the SD card. If you are doing this on your computer, you can destroy your hard disk partition if you pick the wrong block device.

You would likely type this command in a terminal on a Linux PC with your SD card inserted to a card reader that appears as block device /dev/sdX where X is a letter.

The reason why you are getting the file not found in your particular example is that you have a pipe character "|" in place of "l" (a lowercase "L"). The pipe character is used for "piping" data between programs on the commandline, so it stops parsing the rest of the commandline at that point.