Hi there,

What I could suggest in this case is to either use FileZilla with SFTP to access and modify your files as described here:

https://www.digitalocean.com/community/tutorials/how-to-use-filezilla-to-transfer-and-manage-files-securely-on-your-vps#editing-text-files

Or if you feel comfortable with the command line, you could do that via your terminal with SSH instead:

https://www.digitalocean.com/docs/droplets/how-to/connect-with-ssh/

Let me know how it goes!
Regards,
Bobby