Myriam, if you have CRON running, you should have got the "Update platform" notice in your admin panel already and could have updated just by clicking on that notice.
CRON configuration guide:
http://docs.oxwall.org/install:cron
>>i have Filezilla and want to know if i can just tranfer the update pack
from my pc to the public html folder in my server using Filezilla to
achieve the update, or do i have to make data bases or anything else .
Manual update instructions can be found here:
http://docs.oxwall.org/install:update