ROOT Problem HELP!!

[MichaelRam]

I'm having a problem with the last few steps in the process of rooting my tmobile s3.
When i go to install the CWM-SuperSU-v0.87.zip in recovery, it tells me

Finding update package....
Opening update package...
Verifying update package...
E:signature verification failed
Any help? thanks

 

[meyerweb#CB]

Can you give us a link to the procedure you're following, and the files you downloaded (if it's not clear from the link)?