I called my ISP’s support. The person moved my theme to a different directory. Then I could logon as Admin, bring in a new copy of the theme, and activate it. I still had the content, but had to re-apply my GOOD changes.
Fixed.
Thanks again, macmanx.
Thanks, my site does not yet let me have FTP (I need to pay to upgrade). My simplest fix would be to rollback the change – or, as you say, re-edit in a text editor.
Thank you! (although I’m not fixed yet).
Mike.