Thanks for your prompt reply. Sorry, it is not the capitalization, I checked, both name was using small letters, corona parent and corona-child. I tried deleting the corona-child using Filezilla , creating new folder corona-child under parent folder corona, still it does not work. I also tried following the steps below:
1. Download corona child-theme
2. Used ftp to upload the folder found inside the zip and place under Corona theme. Then tried going to backend where you normally activate themes, and you will see an option to activate the Corona child - but nothing is there.
I am trying to upgrade from 1.2 to 1.5. After spending lots of time reading your forum I realized installing the child theme would be the best option, but I have spend over 12 hours trying to get child theme working. Can you please try login in my web site as admin and see if you can please fix it? I can email you the user name and password. website is: http://www.onetouchon.com/wp-admin/ . User name is my user name here onetouchon, pwd I can email to you.
Thanks very much for your help, much appreciated.