On our shared and reseller hosting packages the file and folder permissions are normally automatic.
In most cases the following applies:
Files should be - 644
Folders/directories - 755
You can change file permissions within the file manager of cPanel or within many ftp clients by right clicking on the file or folder. If you have any questions about securing your websites permissions, please refer to the documentation provided by the developer or contact our support team.
Common scripts documentation:
Many popular scripts and content management systems give their own advice on file permissions in order for the scripts to work correctly. You can find links to some common ones here: