Default [Q] (HELP NEEDED) Rooting Samsung Galaxy Please Help and Thank You

Hi I have a problem with rooting my samsung galaxy vibrant t959
I have the update.zip file in my sd card but when I go into recovery mode It keeps saying
E : Can't open / sdcard/update.zip (No such file or directory) Installation Aborted
I am a first time rooter so I do not know very much in that topic
Ask me info if needed
Please help me
Thank you