I have vps and when i open the filezilla i cant enter in root folder but my script installed in root folder. Any ideas how can i open it?
Please be more specific. Where did you install Filezilla, in the VPS ?
If you mean that you try to access your server from your work pc with Filezilla, it's normal that you can't access the root folder.
FTP Servers forbid the access with root account, they run under another user and not with root permissions (only if you manually configure it to do it).
Another cause is that you do not install and setup a FTP server in your VPS. OVHcloud provide only SSH access to your VPS when you get it.
If you want to connect to your server with a GUI application to upload/download files or even explore your system, check https://winscp.net/eng/download.php WinSCP.
Please check the above and reply in case your issue is not solved.