“Just as a note, with something like FileZilla, you can edit the post on the host side by right click on the file and editing it, then make the change, exit and say yes to save, then tell filezilla to resave that changed file. Sounds more complicated than it really is… “
Filezilla needs to have the filezilla setting of “file viewer/editor” set to a plain text editor. (NOT Word. Something like Ultraedit, or equal.)