go to this folder C:\Program Files\IEPro\userscripts
there you will find the userscripts already available for use, you just add your script in that directory. (Make sure ie is not running).
Then once you have put your script in there, just launch ie then go to
Tools-> ie7pro preferences ->
then click on the userscript tab then click make sure your userscript has a tick in it's box, then just click the reload all userscripts option, then click ok
shut down it, then re launch it and your userscript should now be working. :)

