Need help TFTPing a file

I'm trying to TFTP a file to my router (upgrading it to DD-wrt.)
The instructions say the following:

If you're on OSX, enter tftp -e 192.168.1.1. At the tftp> prompt enter put dd-wrt.v24_micro_generic.bin at your shell

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For Windows, it says:

If you're on Windows, enter tftp -i 192.168.1.1 put dd-wrt.v24_micro_generic.bin at your cmd shell

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I don't know exactpy what to do though. I type " tftp -e 192.168.1.1" and it pulls up the "tftp:" line, but if I type in the file name, or the full path, anything, I get this error:

No such file or directory

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What am I doing wrong/exactly what should I be doing?

More or less, what EXACTLY should I type in to transfer the file over? Here's the lionk I'm getting the instructions from: http://www.dd-wrt.com/wiki/index.php/How_To_Flash_the_WRT54Gv8

You could try specifying the path with the file name, something like ~/Downloads/filename.bin instead of just the filename.