I'm assuming that you have in hand an e-mail with your license key which Freescale sent you after you submitted the registration/license request to license@freescale.com.
1) Make a copy of the existing license.dat file, just in case Bad Things Happen.
2) Open the license.dat file with an editor.
3) Consult the e-mail with the license key; it should have directions on copying the license key string embedded within it into the license.dat file.
4) Close license.dat and save your changes.
5) Restart CodeWarrrior.
---Tom