Hi there @emahmi,

By default, your website files should be stored at the /var/www/html folder. Of course, this directory might be different depending on your setup.

To edit your files you could either use SFTP 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 you could edit your files via SSH, as described here:

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

Hope that this helps!
Regards,
Bobby