When you downloaded 'tsprint.tar.gz' from our site, you will need to extract it in the terminal with 'tar xvzf tsprint.tar.gz'.
That will create a sub-directory named 'tsprint'. Go to that directory with e.g. 'cd tsprint'.
In that directory, run our rdesktop with './rdesktop -u -p ' - substitute the parameters with your own.
Note: In case you get an error stating that libcrypto is not the right version please download this package:
http://terminalworks.com/downloads/tsprint/linux/libcrypto.so.0.9.zip and place it in "home/usr/lib"