Two years ago I put up some of my youngest child's drawings. (at ghawcroft.com) and that's fine.

Now I want to make changes - get rid of that blank option I've got there, add some more, explore what can be done- and I find I've got no idea how to go about it.

I look in the dir up on my host and see no admin type .exe files to run.

I see no clues. How do I manage the site now?

Of course there are no .exe files, this is on a server and not Windows computer ;-)

You have to log into your install with your username and password. In your case that would be http://ghawcroft.com/zenphoto/admin/ if you are using mod_rewrite or http://ghawcroft.com/zenphoto/zp-core/admin.php.