I have a php symfony site hosted using FTP, it has multiple databases, need to make changes.

I have a php symfony site hosted using FTP, it has multiple databases, I tried making some small changes, I changed a few spellings to see if those changes will be reflected in the deployed website, but they are not being reflected, I saved the files after making the changes too, what else do I need to do to make sure that my changes are visible after I make them in the files and how I make sure which is my deployed FTP database.