To set permissions using a FTP client (software application), select the file or folder you wish to change and right-click, then select "attributes" or "Properties".
For my example I will be using WS_FTP Pro. Follow these steps:
1. Login to your FTP account
2. Right click on he file or directory you want to change permissions
3. Select "FTP Commnads >> then select CHMOD(unix).
4. Once you have selected CHMOD(unix), you can set the permissions
5. Click Ok, are you are done.
Most scripts require permissions to be set to chmod 755.