Simple PHP plugin, get error

Weird, just tested it and it works. You might have some weird user capabilities going on.

Alternatively, go to "Plugins > Editor" and choose Generate Simple PHP from the list.

Then click on custom.php and add your PHP in there :)

Just deactivated all plugins

When I go to Plugins >> Editor there is NO Editor field

Simple PHP is active

You should see something like this: http://screencast.com/t/7j72mZ9cM5lf

If you don't, the account you're using doesn't have permission to edit plugin files.

Thanks, that helped me, I had a plugin, even when deactivated was interfering with permissions

Awesome, glad you got it working :)