You should be able to click on the fixture in question on your fixture list.
The Match summary screen should then appear.
Then in the bottom right hand corner there will be instructions on how you want to view the match. Either above or below these options is "save as" I think.
Clich "save as", select a file name related to your problem and then save it. It waill save instantly.
Then if you go to...
My documents.
Sports Interactive.
Football Manager 2008.
Matches.
The file should be saved there.
Then you need to open the ftp, (which is another problem entirely), but the instructions can be found
here.
The pkm should be sent instantly, Unlike a save game, and that's it.
Job done.
Hope that helps.