Hello,
You can edit that using FTP access or File Manager plugin (be very careful with the last one because you may cause a fatal error if you are not sure what exactly to edit). I used File manager because you missed to add SFTP user to allow me to use FTP connection. So, I opened file, changed the mentioned code and saved it. That’s all. If you are not sure in your actions then it would better to ask hosting support to avoid problems.
Regards