Now you need to import it. I assume, this is Rasheed Wallace?
First you'll need fsh. file viewer and importer - FshX for example. Grab it from here:
http://download.nba-live.com/index.php?act=view&id=81 Remember, if you want to use FshX, your created bhed must be saved as bmp. file, or png.file.
Then, you have to extract rawalla.fsh to your hard drive, so download EA Graphics Editor from here:
http://download.nba-live.com/index.php?act=view&id=14 Run EA Graphics Editor and open NBA Live 08/sgsm/players/plyrface.viv, search for rawalla.fsh, click on it, and find button EXTRACT. If program asks you, to decompress the file - say YES.
Now run FshX, and open with this program, your extracted fsh. file - rawalla.fsh
Now, click on TEXTURE, and IMPORT. Choose your created Wallace bhed, and overwrite. Save the file.
The last thing to do, is to put that changed rawalla.fsh file to your sgsm folder. That's it!